MaxxCasting Uses Cell Network Thinking To Make FM Radio Seamless

FM radio has a dirty little secret: the coverage map looks bold and confident, but the real audience listens six feet off the ground, weaving between buildings, hills, and interference. That’s where signals get chewed up, where audio turns fluttery and hollow, and where listeners quietly tune away. I walk through why this happens and why the old “just add a booster” approach can actually make things worse in the overlap zone. 

Then we get practical. MaxxCasting, built by GeoBroadcast Solutions with GatesAir hardware, is basically cellular network thinking applied to FM: multiple low-power, highly directional booster nodes on the same frequency, engineered with terrain data and field measurements, all time-aligned so the transition in your car is seamless. The engineering matters, but the stakes are bigger than sound quality. If the Nielsen Portable People Meter can’t decode your signal, your listening doesn’t count, your ratings slip, and advertisers never pay for the audience you actually have. 

We also tackle the question engineers always ask: how does the Emergency Alert System fit into a synchronized booster network, and what changes when you add zone casting, the FCC-approved option for short bursts of localized content. I explain the override concept, the compliance expectations, and why the NAB still has concerns about real-world scaling. If you care about FM coverage, broadcast engineering, radio ratings, and where terrestrial radio goes next, this is the clearest starting point. Subscribe, share this with a radio nerd you know, and leave a review on your podcast app so more people can find the show.

Transcript

Max Casting Comes To NYC

Tyler 0:00

So, Audacy just announced they're deploying MaxxCasting into New York City.

Salsa Commercial 0:06

New York City.

Why FM Coverage Maps Mislead

The Booster Overlap Distortion Problem

How MaxxCasting Synchronizes Boosters

Ratings And Revenue Behind The Tech

Tyler 0:08

WCBS-FM and WXBK-FM. And I had this embarrassing moment where I realized I've been hearing this term for a couple of years now. I work in broadcasting, and I genuinely couldn't explain to someone how it actually works, if they asked me right now. So instead of pretending any longer, let's learn this together. This is the Tyler Woodward Project, and today I'm talking about MaxxCasting, what it is, how it works, whether if it's the future of FM radio or just a really good marketing tactic from a company in Chicago. And because I know you're going to ask, how the hell does EAS fit into any of this? Let me start with the problem MaxxCasting is trying to solve because none of this is going to make sense without that. FM radio has a dirty secret. Your main transmitter is on top of a tower, somewhere pumping out the signal. Coverage maps look great, right? Big confident circles, lots of color. But those maps were drawn, assuming ideal conditions and rooftop antennas. And that's not where your listeners are. Real listening is happening down in the cars, maybe six feet off the ground, moving through city streets, threading between buildings, rolling through valleys. Terrain eats signal. Buildings eat signal. GeoBroadcast Solutions, GBS, the company behind MaxxCasting, and no, this is not sponsored, says as many as 80% of FM stations don't fully cover their own licensed service area because of this. 80%. So for decades, the fix was throw up a booster transmitter. Same frequency as the main, extra power, fill the gap. Simple idea. The problem is in the overlap zone where the main signal and the booster signal are both hitting your car radio at the same time from slightly different distances. They arrive a tiny fraction of a second apart. That tiny little misalignment, that fraction of a second, turns your audio into a muddy, hollow, fluttery mess. Listeners are going to tune away. Engineers cringe, nobody wins. That's the problem MaxxCasting was built to solve. Okay, so what actually is it? MaxxCasting is a system developed by GeoBroadcast Solutions in partnership with GatesAir, who makes the transmitter hardware. At its core, it's a synchronized network of multiple low power FM booster transmitters, strategically placed around a market, all locked to the same frequency as your main station, all carrying the same content and perfect time alignment with each other. The key word is synchronized. GBS basically borrowed a page from the Cellular Network Engineering playbook. They looked at how cell carriers build overlapping coverage with nodes no uh dead zones and said, We can do this for FM. The system uses GatesAir Flexiva transmitters and their Intraplex Synchrocast IP distribution system to lock every booster node to the same audio timing as the main. When your car radio moves from the main signal into the booster zone, the transition is completely seamless. Your ears don't notice, your radio it doesn't stutter, your PPM meter doesn't miss a beat. And this isn't just point some antenna at a city and hope for the best. The boosters are are you know they're low to the ground, highly directional, pointed precisely where the coverage gap is. GBS does all the network design using high resolution terrain data, actual build-in heights, real-world field measurements. And not only that, but they're using vehicular traffic patterns. They're treating it like a cell deployment, which means it's actual engineering instead of guesswork. Now here's why a broadcaster actually cares about this beyond hey, it just sounds better. If your signal is too weak or too distorted in part of your market, the Nielsen Portable People Meter, the little pager-looking device Nielsen uses to measure radio listening, it can't decode it. No decoded signal means no measured audience. No measured audience means those listeners don't exist, as far as your ratings are concerned. And no ratings means advertisers aren't paying for them. You're broadcasting to real people, but they don't statistically exist. KQED Public Radio.

KQED-FM Legal ID 5:34

KQED-FM San Francisco, KQEI-FM North Highlands, Sacramento. Good afternoon.

Who Uses MaxxCasting Today?

Engineering Requirements And Workflow Impact

Zone Casting And The EAS Debate

Is MaxxCasting FM’s Future

Where To Follow And Support

Tyler 5:41

Has held the number one overall station position in San Francisco since activating Max casting. Audacy then deployed it on KLLC and KITS and added seven booster nodes that extended their reach to another 800,000 people in the South Bay. Nationwide, GBS claims 13 million incremental listeners added across all deployments. And look, I take vendor numbers with a grain of salt. But when four of the top five stations in a market are using your product, I mean, something's gotta be working, right? So who's actually using this thing? As of late 2025, GBS has deployed in 11 markets San Francisco, Los Angeles, Chicago, San Diego, Miami, Baltimore, Boston, Cleveland, Las Vegas, San Jose, and St. George, Utah. New York City and Atlanta, they're in the design phase right now. Six of the top 10 Nielsen radio markets either have it or are working on getting it. And it's not just commercial radio either. WYPR in Baltimore, an NPR affiliate, deployed MaxxCasting to link WYPR on 88.1 FM in Baltimore with WIPF on 88.1 and Frederick, covering the I-70 corridor between the two cities. Before MaxCasting, those two same frequency transmitters were fighting each other in the overlap zone. Now they're synchronized, problem solved. The deployment spans Bonneville, Audacity, Spanish Broadcasting System, the Educational Media Foundation, West Virginia Radio Corporation, a genuinely broad mix of group owners and independents. Alright. How complicated is this for engineers? To be honest. Well, the honest answer is it's a real project, not a plug-and-play box. GBS does do the heavy network design work terrain modeling, propagation tuning, interference zone analysis, and they're treating it like a cell network design, which means it's sophisticated. At each booster site you need a GatesAir Flexiva transmitter, um a directional antenna at a deliberately low height, and a stable, dedicated IP connection back to the main station for the synchrocast synchronization to lock. That distribution path needs to be a reliable managed IP circuit, not the public internet, because the timing requirements are tight and you can't have jitter messing with it. Each booster site also needs to be licensed with the FCC as a booster facility. Standard process, but it adds a little lead time. GBS handles most of the FCC filing support as part of the process. So it's not two engineers in a weekend, but it's also not a two-year custom engineering odyssey. It lives in the significant project with expert support category for programmers and traffic people. In its base form, MaxxCasting requires exactly zero changes to your workflow. Every booster carries the same audio as the main in perfect sync. Your automation system, your playout, your traffic logs, completely untouched. The transmitters are just invisibly extending your signal, completely transparent to the programming side of the house. Now that changes if you move up to Zonecasting, GBS's next level product that the FCC fully greenlit last year. Zonecasting lets you originate up to three minutes per hour of different content on specific booster zones. Think localized ads, neighborhood traffic, whatever you can think of. That does require automation integration to schedule and insert zone specific content, but that's an optional upgrade, not the base product. Now, let's talk about the emergency alert system, because I knew this was coming. In a standard MaxxCasting deployment, EAS works exactly the way it always has. The main transmitter carries the alert, the boosters relay it in perfect sync. Listeners everywhere in your coverage area hear the alert simultaneously. From an EAS standpoint, the system behaves like one big giant radio station. No gap, no delay, no problem. The complication enters with Zonecasting, where a booster is originating its own content during those short local windows. The concern, and it's a fair one, is what happens if an EAS alert fires while a booster zone is airing localized content instead of the main feed? GBS's answer is that EAS overrides the zone content immediately. The FCC requires EAS compliance for all originating boosters. And found in its review that properly engineered systems handle this without disrupting alert delivery. The NAB's counterargument is that GBS tested this under controlled conditions with a small number of sites. And a large-scale real-world deployment across complex RF environments, it hasn't been independently vetted at scale. That's not an unreasonable concern to raise. The NAB had a lot of feelings about Zonecasting in general. The engineering side just works. For Zonecasting, the override mechanism needs to be solid and design needs to be done very carefully. So, is MaxxCasting the future of FM radio? Honestly, it's a really practical bridge. It doesn't reinvent radio. It doesn't solve the streaming problem or make FM cool again by itself. What it does is recover the audience FM was supposed to have. The people inside your license contour, who just can't hear you clearly enough to count. That's a revenue argument as much as a technical one, to be honest. For engineers, it's real work. But it's it's a well-supported product with a methodology behind it. For programmers, in its base form, it's completely invisible, which is kind of an elegant solution, really. For listeners, they'll just notice that a station sounds better in the neighborhood where it used to cut in and out. In the Zonecasting piece, geo-targeted local content, hyper-local ads, neighborhood-specific information, that's where it gets genuinely interesting and genuinely controversial. That's one I'll save for a future episode. For now, MaxxCasting is what happens when someone finally applied a cellular network thinking mindset to an FM booster problem that's been annoying engineers for well over 40 years. I'm Tyler, thanks for listening to the Tyler Woodward Project. Follow me on Instagram, Bluesky, and Threads @tylerwoodward.me. Make sure you head over to Tylerwoodward.me, check out the brand new website, you can get in touch with me over there. And whatever podcast app you're listening to this on Apple Podcasts, Spotify, Amazon Music, YouTube, Pandora, leave uh a review, a like, subscribe, all that stuff. It it helps. I'll catch you next time.