Can you click on individual markets? Doesnt seem to work.
You can click based on TV markets (which generally also coincide with FM radio markets) for either cumulative or recent weekly expenditures. Some of those markets are geographically huge, so if you find a huge dark area in north-central Nevada and find that some place that couldn't possibly be getting its TV by direct broadcast from Reno and see "Reno", then it is because a place like Elko gets TV signals rebroadcast from Reno. Much the same applies to places like Silver City, Gallup, Santa Fe, and Roswell in New Mexico because those cities get their broadcast TV (and political ads) through Albuquerque. Some markets bleed into other states, as with that of Minneapolis-St. Paul reaching westernmost parts of Wisconsin.
You can ignore the cumulative spending because much of that involves spending on primaries. A state like Georgia drew copious money early because of a long-past Republican primary; that is long over. The current ones say where opposing sides have hotly-contested races for the Presidency (the legitimate swing states, and Michigan has dropped out as one of them) or a Senate seat (Massachusetts is the most obvious one that is not a swing state). So a legitimate swing state with a hotly-contested Senate seat (Florida, Ohio, Virginia) will have lots of money thrown into political advertising.
The pattern can change. So if the US Senate race in Indiana heats up and the US Senate race withers in Ohio that will probably reflect itself in huge ad buys in Indianapolis, South Bend, Fort Wayne, Evansville, Terre Haute, and maybe Louisville markets. Spending in Cincinnati and Dayton markets might remain the same but be directed more toward Indiana viewers.
All House seats will be up for grabs, and there are some swing districts that will draw attention - -maybe late, but with huge amounts of money in non-swing states.That could be evident in sure-thing states for the Presidency... like Texas and New York.