Wireless Microphone Frequency information from Sennheiser
Wireless Manager - Software | Audio-Technica
Amazon.com: Pyle Professional 8 Channel UHF Wireless Microphone System 8 Handheld Mics Rack Mount Receiver Base RF & AF Radio/Audio Frequency Digital Display Independent Channel Volume Control (PDWM8250),Black : Everything Else
Wireless Spectrum Topics
RF 101 - The Basics of Wireless Mics and In-ear Systems