eBay auction for Raven Industries in-line GPS L1 amplifier Item number 370437343397 $25 plus shipping Raven Industries Inline GPS Amplifier Model LA-12-1575-100N http://www.navtechgps.com/Downloads/LA-12-L1L2.pdf Female N Connectors on each end I've ordered one; he's got around ten remaining. 73, Bob K6RTM