Ask ChatGPT for “the best plumber in your town” and you’ll probably see the same handful of names. Now ask the identical question for the town twenty minutes up the highway — a town those same plumbers serve every week — and most of them vanish. The trucks make the drive. The recommendations don’t.
That’s recommendation decay: the measurable drop-off in how often AI engines mention a business as the location in the question moves away from the location in the business’s written record. And for most local businesses, the visibility radius is much smaller than the actual service area.
Why the drop-off happens
AI engines like ChatGPT, Perplexity, and Gemini don’t know where you work. They know where you’re written about. When someone asks for a recommendation “in Chino Valley,” the engine looks for businesses whose web presence — their site, their directory listings, their reviews, the local news that mentions them — connects them to Chino Valley in plain text. If every sentence ever published about your company says “Prescott,” the engine has no evidence you exist twenty miles north, so it recommends someone who does have that evidence, even if they’re worse at the job.
This matters more every month, because AI answers are increasingly the only answer people see. Bain & Company’s 2025 research found that about 80% of consumers now rely on AI-written summaries for at least 40% of their searches — and roughly 60% of those searches end without a single click to a website. Gartner projects traditional search engine volume will fall 25% by 2026 as people shift to AI assistants. If the AI answer skips you, there’s no page two where the customer finds you anyway.
The good news: the radius is fixable
The Princeton GEO study, published at ACM KDD 2024, tested nine content methods and found that specific changes — adding citations, quotations, and statistics to your pages — improved a source’s visibility in AI-generated answers by up to 40%. The same principle applies geographically: engines cite the sources that give them concrete, checkable evidence. A page that explicitly documents your work in a neighboring town is exactly that kind of evidence.
In our own client audits, the pattern is consistent. A business can dominate AI answers in its home city and score near zero in a suburb it has served for a decade — purely because nothing on the internet says so in words an AI can quote.
What to do about it — today
You can start shrinking the gap this afternoon. Here’s the priority order:
- Write your service area in sentences, not a list. “Serving Prescott, Prescott Valley, Chino Valley, and Dewey-Humboldt” buried in a footer is weak evidence. A sentence like “We’ve repaired water heaters in Chino Valley homes since 2009” is a fact an engine can lift directly into an answer.
- Build one real page per major service town. Not a copy-paste template with the city name swapped — a short page with genuine details: the neighborhoods you work in, a project you completed there, the drive time from your shop. Thin duplicate pages get ignored; specific ones get cited.
- Ask customers in outlying towns for reviews that name their town. A Google review that says “came out to Dewey same day” is third-party geographic evidence — the strongest kind, because you didn’t write it yourself.
- Match your listings to your real footprint. Google Business Profile, Yelp, and industry directories all have service-area fields. If they only name your home city, every AI engine reading them concludes your radius ends there.
- Get mentioned in the next town’s sources. Sponsor the little league, join the neighboring chamber of commerce, land one mention in that town’s community paper. One authentic local citation outweighs ten footer keywords.
The quick self-test
Open ChatGPT and ask, “Who’s the best [your trade] in [your home city]?” Then repeat the question for every town you actually serve. Note where your name stops appearing. That boundary is your real AI visibility radius — and every town outside it is revenue going to a competitor whose paperwork is better than yours, not their work.
The businesses winning AI search in 2026 aren’t necessarily the best in their region. They’re the ones whose written evidence matches their actual footprint.
Want to see your radius measured properly? Get your free AI visibility score at rankforward.ai/score — we’ll show you exactly where the engines recommend you today, and where they don’t yet.