TSA (Total Survey Area)

TSA is the outer-ring geography for audience measurement. Where the Metro Survey Area (MSA) covers only the core city and its immediate commuter zone, TSA extends outward to every county where the station has measurable listenership. For a regional FM station broadcasting from a major market, TSA listenership can exceed MSA listenership by a factor of two or three.

TSA ratings matter enormously to regional advertisers: the tractor dealer, the vacation resort, the outdoor outfitter: whose customer base lives in the surrounding counties and small towns, not downtown. A station that underperforms in MSA but dominates TSA can still be the right buy for the right advertiser, and knowing the geography matters more than the raw headline rating.