Total posts : 45366
In the Baltimore area I am stuck between the DC, Baltimore, Philadelphia, York/Lancaster/Harrisburg and Fredric stations. The Chesapeake Bay makes an excellent medium for radio to propagate over, so even stations from the Eastern shore come in quite strong. So if I want to use FM to transmit around my yard/court, I had to find the least bad frequency. Radio Locator’s unoccupied channel tool does not work for my area, most of the channels it says are open are not because of stuff coming in from across the bay. So I used my method described in post 1 to find the channel that was most removed from where the FCC might consider a service area for a full power station. Going up and down the dial in my car I hear something on every station, unless there is a local IBOC station, in which case I don’t hear anything on the adjacent channels to the IBOC local. Even 87.7 has two signals on it around here, an analog CH6 LPTV on the eastern shore being used for Christian broadcasting, and an analog CH6 LPTV in DC that has a Spanish format. 87.9 is useless from the IBOC sideband on 88.1 NPR.