While working on a current limiter circuit for a GPS bias tee, I decided to measure some antennas I had laying around to see what voltage they wanted and at what current. I thought others might be interested in the results. I used a network analyzer to sweep 1 - 2 GHz with a little stub antenna, and set the antenna next to that. The resulting signal level at the peak frequencies seemed reasonable. For each antenna, I started at 0V and increased until the amplitude of the filter peak stopped getting bigger, and recorded that voltage and frequency. Other than voltage and current, everything was very uncalibrated and random. Results below, in no particular order John ++++ Motorola ANT1A07975 mag mount hockey puck: Full gain: 4.7V @ 19mA Generic hockey puck of unknown age (but old): Full gain: 6.5V @ 23mA. At 5V, down about 3dB and current 17mA. Generic bullet timing antenna: Full gain: 4.2V @32mA; 37mA @5V -- fairly sharp filter peak Symmetricom 53532A L1 Reference Antenna (bullet): Full gain: 3.8V @ 18mA -- *very* sharp filter peak u-blox ANN-MB-00-00 mag mount dual-frequency hockey puck: Full gain: 1.9V; 17mA @ 3.3V Ashtech ASH11661 dual-freq survey antenna (pretty modern): Full gain: 2.6V @ 54 mA AeroAntenna AT2775-42NTW-TNCF-000-RG-26-NM dual band survey antenna: Full gain 5.8V @ 44mA Trimble Zephyr Geodetic: Full gain: 4.33V @ 96mA (!) -- at least 10 dB more gain than any other