[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 ...

Using cheap RTL-SDR dongles and Python ... The two antennas in question was a single band inverted-L and smaller broadband T3FD antenna. [Eric] first gathered performance data for each over ...