It should be noted that PCTel acquired a number of antenna manufacturers (1999-2005), Antenna Specialists, Micropulse, some Andrew products, Maxrad. The GPS antenna referenced, GPS-TMG-26, is virtually identical to the earlier Maxrad GPS antenna that is found surplus through many venues. http://www.antenna.com/artifacts/2010101GPS-TMG-26N.pdf Install instructions http://www.antenna.com/artifacts/MIS_TIMING_GPS26.pdf For UNKNOWN used commercial GPS antennas, they are fairly generic. Many used antennas are a patch or helical design that have an internal LNA powered by +5 VDC on the antenna line (powered from receiver) with a variety of connectors (F, TNC, BNC, N). HOWEVER ... BEWARE of +12 VDC powered antennas and receivers -- often found with early dedicated timing solutions. -- IF the antenna has a multi-conductor cable, it is most likely an integrated outdoor receiver and antenna with the cable providing voltage and data line using RS-485 or RS-422 standard. greg w9gb > > The GPS Antenna Micropulse Z1001 appears to be what is now > designated GPS-TMG-26 > Sent from iPad Air