The Gap Between Perception and Performance
When businesses rank the channels they trust to deliver ROI, radio rarely ends up near the top. The reasoning is usually the same: digital advertising is trackable, radio isn't. You can see exactly how many clicks a Google ad drives. You can't see what a radio spot did. So the assumption is that the radio spot did less.
The research has been quietly dismantling that assumption for years. The problem is that most advertisers are making budget decisions based on the ease of measurement, not the actual performance data. Those two things are not the same, and confusing them is one of the more expensive habits in local media planning.
What a $2.2 Billion Analysis Found
In 2025, a joint study by WPP and Radiocentre analyzed $2.2 billion in media spend across 142 brands. The findings were direct: broadcast radio's two-year ROI was 22% above the all-media average. Its 13-week short-term ROI was 23% above average. This was one of the largest independent analyses of media performance ever conducted across that many brands. Source: WPP/Radiocentre, 2025.
Nielsen's Global Compass database tells a similar story. In its measurement of return per dollar invested, radio delivers $2.00 — ahead of display ($1.52), search ($1.16), and connected TV ($1.15). Only social media, at $2.22, edged it out. A separate six-year Nielsen study found radio advertisers returned an average of $10.59 for every dollar spent. Source: Nielsen.
None of this is obscure. The studies are not hard to find. The issue is that the research doesn't come packaged in a dashboard, so most advertisers never encounter it at budget time.
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Reach and Attention Efficiency
ROI figures are useful, but reach and attention efficiency fill out the picture. Radio's weekly reach among adults 25 to 54 now stands at 71.4%, according to Nielsen — edging past linear television's 69.8% for the first time in recorded media history. The audience that local advertisers most want to reach is listening to radio at higher rates than it is watching TV. Source: Nielsen, 2025.
In-car audio is particularly relevant for a market like the Treasure Valley. Eighty-six percent of all in-car ad-supported audio listening goes to AM/FM radio. Source: Edison Research. People commuting on the connector, running errands across Meridian, making the drive from Nampa — the overwhelming majority of what they hear in the car is broadcast radio. The Treasure Valley's commute patterns make that reach even more concentrated than in denser markets where transit fragments the audience.
On attention efficiency, a 2025 analysis found radio's attention cost per thousand impressions was ten times more efficient than average online video advertising. You can argue about which format is "better," but the cost to earn a person's genuine attention is dramatically lower on audio than on the digital formats that dominate most local ad budgets.
The Attribution Problem Is Solvable
The main reason radio ROI goes unmeasured isn't because the return isn't there. It's because the last-click attribution systems most local businesses use weren't built to credit awareness channels. Someone hears your name on the radio for eight weeks, then searches for you on Google, then clicks your ad, then calls. Google gets the conversion credit. Radio gets nothing in the report.
We've written about how to measure radio's actual contribution — the short version is that web traffic spikes in the minutes following a spot airing are measurable, and the pattern repeats with remarkable consistency. A 2026 analysis of 2,300 radio campaigns found an average 23% web traffic lift within 15 minutes of a spot airing. Source: Veritone Attribute, 2026. That's not invisible. It's just not being looked for.
The businesses in the Treasure Valley getting the most out of their radio spend are the ones who've connected those dots — running a consistent schedule, tracking web and call data by time of day, and building a picture of what the audio is actually producing. The ROI is in the data. It requires deciding to measure it.
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