The antenna for 10, 15 and 20 meters, is a FB-53 tribander from Fritzel with 7.3 m boom length. It’s approximately 21.5 m above the ground.
Measurement data for FB53 with the radiator and parasitic elements extended 2x3cm at the ends. Resonance at 14 MHz lowered about 120 kHz:
- The gain over a dipole on 20 m has been found to be about 3 dB on the CW portion. The measurement was made with a reference dipole and Reverse Beacon stations on the US East coast.
- Standing wave and F/B ratios below.
Measuring antenna was a delta loop at a distance of 100 m and height above the ground about 4 meters.