Cant help you on your area but here is some info. Remeber that since wireless microphones operate with 50 mW or less, the receive range will be limited to several hundred feet or less. I know the ones used here have about 500' range.
You will have to search these freqs to find active freqs.
VHF (165-172) MHZ
This range is most commonly referred to as the “Traveling Band” and is used primarily for wireless microphones. In recent years this range has become very congested due to the sheer number of users, and in many areas these frequencies may be too congested to get reliable performance. the 169-172 MHz “traveling frequencies” are the only legally licensable VHF frequencies available to a non-broadcaster user.
The other option is to look at the range from 150-168 MHz for possible open frequencies.
Use in the entire range is subject to FCC rules part 90.
UHF Mid (470-806) MHz
This range of frequencies comprises the balance of the television broadcast band. This range of frequencies represents the newest area for wireless microphones because of the vast range (336 MHz UHF versus 42 MHz VHF) and there is very little usage by comparison with VHF. The FCC (U.S.) and DOC (Canada) rules allow wider transmission bandwidth and far greater output power, which results in superior audio quality and longer operating range. The greater total bandwidth also allows for more simultaneous operating channels than the VHF range.
Detroit Area Wireless Mic's "known"
165.0875 166.0875 165.185
