I work in ankeny and i get a lot of stuff up there. Here is a good list of a few things
Ankeny Fire, Ankeny Police, Racom Des Moines (polk county tgs) Polk County Fire. If you want to listen a bit farther depending on where your at in ankeny, you can get westcom, story county trk (which Ankeny Pub Works is on). Another good one would also be the Iowa State patrol and if you have digital you can pickup car/car action plus DOT Road workers