I use a pair of RS 900MHz wireless intercoms. I use one on VHF/UHF a/c on 910MHz; one for VHF Fedcomms on 913MHz. They are WBFM, so you need a scanner that does WBFM unless you use one of the intercoms to listen. I bought an original pair when they were in stock; found a second pair on ebay a few years ago. My units are in the basement and have a range around 75' - 100' on the outside. They also give a bit of privacy, if you listen on FM on the scanner the tx are garbled. This model has 4 freqs: 910 - 911 - 912 - 913MHz. Use AC/4 AA batts.