I use them on one of my 4 feeds.. They work good but you may need to attenuate the input from the scanner to prevent distortion. Listen to the Harford County Maryland Fire, EMS and police feed on broadcastify.com if you want to hear one live. It is being fed from the line output jack on a HP-1 scanner
PRO668, HP 1, WS1080, PSR800, PSR600, PSR500, PRO2096 (2), PRO106, BCD 296D P25 card, Commercial FCC license, Ham General, FAA Private Pilot, Business Owner, APCO Certified Tech.