Made by The BetterRF Company - plugs into the Molex connector on rear of radio. Check it out at http://www.qth.com/betterrf/ This is brand new, never used. $22 which includes free shipping. Mike, W4UM (ex-K4KUZ) w4um at arrl.net South Florida DX Association http://www.qsl.net/k4fk/ Florida Contest Group http://www.floridacontestgroup.org