This happened with me also when I replaced home made Cantenna by FA 26 inch antenna. Initially I thought it is due to connectors, and tried many different connectors, but no improvement. At last I added FA filter, and problem was solved. I live in an urban area with lot of cell phone antennas around.
Since FA antenna is high gain, and picks much more cell phone signals than a low gain home made antenna, and since ProStick has rf pre-amplifier, this combination overloaded the receiver tuner chips. Adding a Filter solved my problem.
But FA filter does not filtering GSM signal at all (FA is filtering to 925 MHz, BTS downlink 980 Mhz). Having 4 BTS’ near me FA filter is useless.
Besides with FA Filter + FA Antenna I got far worse results that with antenna itself (range, messages, “holding” signal).
I dont have FA dongle and LNA or other amp on my setup. Simple genercic dongle.
Thank for help, but it does not apply to my setup at all.
My setup is following:
FA antenna → (N) RF-5 feeder (SMA) → generic dongle with SMA female plug (soldered out MCX).
Homemade antenna was 12-element co-co made from SiVa RG214U 50 Ohms coax cable.
Only changed antenna in my setup and performance dropped out (for example max range from 210 NM to 160 NM (!)). Messages count drop aprox. 15%.
I’m starting to wonder if there was any damage done during shipping (ModMyPi send it to me like rubbish - everything in the package was moving).