I had the misfortune of using those very PCTEL antennas in a timing application and excessive gain was a problem with the loss of frame sync whenever the receiver had too much signal from any satellite. It was a highly intermittent problem that appeared every few days; always after I had tested and verified things were working, a failure would happen in the middle of the night, the day after I flew home. Of course I had made all of the "terrible choices" of making sure that the antennas had a clear shot to the sky and coax cable lengths were minimized to reduce loss. After a few weeks of fighting the issue the solution ended up being 10 dB attenuators that could pass DC bias. The WiMAX radio manufacturer initially insisted that I ordered third-party GPS timing antennas from somewhere and ignored (their not documented) specification. It got ugly until I provided the invoice showing that I bought those over-amped up antennas from them, right out of their parts list. I still have a few of those antennas floating around here in the house. *Ms. Tisha Hayes, AA4HA*