I think you are describing a thing sold to boost signal in/out of cars. Those I've seen use capacitive coupling to the inside, which has a dipole (two wires inline with the plastic in the middle.. about 12" tip-to-tip for the inside). You may have one where the inside antenna wires are lost or just not inserted yet. Anybody got the antenna formulae (yagi, dipole, patch, etc) for 1900-2500 Mhz range that has "end effects" and propagation velocity compensated? --- Chuck > -----Original Message----- > From: tcwug-list-admin at tcwug.org [mailto:tcwug-list-admin at tcwug.org]On > Behalf Of Austad, Jay > Sent: Wednesday, August 07, 2002 10:13 AM > To: 'tcwug-list at tcwug.org' > Subject: [TCWUG] antenna gurus? > > > A few companies out there make "Passive Repeater" antennas, > where you put > the antenna outside your building connected to one inside, an > it relay's > cellular signals in and out for places with bad reception. > > How would I build one of these? I bought one which was > supposed to work > with GSM 1900, and it doesn't do a damn thing. As far as I > can tell, it's > an antenna mounted to a cheap plastic base and that's it. > Other ones I've > seen have a metal pad on the base and you stick one on each side of a > window, but mine doesn't have this. Maybe that's why it was so cheap. > > Jay > _______________________________________________