Review on 📡 1PC GSM 3G Module Antenna 824-960M / 1710-2170Mhz CDMA WCDMA Aerial with SMA Male Connector, 5cm Length by Kevin Singleton

I used VNA to see how the performance looked. the reference impedance is 50 ohms) with the indicated ranges shown. The first graph covers the bands from 500MHz to 1300MHz with 800MHz, 854MHz and 960MHz markers. The second graph covers the bands from 1300 to 2500 MHz with markers at 1710, 2109 and 2170 MHz. As you can see, the performance is quite decent around 850MHz, with an RL of -20dB. At 800 MHz it only drops down to -10 dB, but at 960 MHz it drops quite sharply (-3 dB). Performance in the 1710-2170MHz range is low. At best, it's worse than -7dB (at 2109MHz) and not even -3dB at 1710MHz. You could probably do better with a piece of wire cut to the appropriate length. But still better than no antenna at all.