I will 3rd that motion.
If all you care about is Ankeny PD you will want the following:
1892 - Polk Law 2 (Ankeny and Johnston dispatch)
1948 - Ankeny Law 3
1889 - Fire Page (all of Polk county)
1841 - Fire Response
You will want to program the nearest tower to you, there is one on the west side of Ankeny by John Deere, the rest of the city is best served by the downtown Des Moines site.