The FCC has approved two LPFM test stations to monitor surrounding facilities for 2nd and 3rd-adjacent channel interference. The test stations are in Avon, Conn. At 107.5 MHz and in Winters, Calif. at 103.1 MHz. Testing firm Comsearch is slated to turn in results in January.
Roots of Radio
The Development of the Directional AM Broadcast Antenna
The advent of the directional antenna made it possible for co-channel stations to operate in close proximity