but it is interesting to see the variety and range of antennas and how they appear internally. L band is from 1 GHz to 2 GHz, so signals and antennas get very strange at these frequencies.

[Mark] had his eyes on the nice quadrifilar helical antenna used by the Vaisla ... antenna with 40 dB gain in the L-band, and with the help of an RTL-SDR dongle he picked up solid signals ...