472 kHz casi sin antena (experimentos de CW a 630 m)
19:27
A Antena HF Invisível
20:58
K8TND VLF Sferics Receiver Experiments ( Sferics Detector ) - VLF Natural Radio
0:12
PORTA MÁGICA
27:06
Playing Music on the Oldest Running Computer in America!
26:47
Apenas 7 pés de altura. Antena DX telescópica curta testada em 11 metros.
13:59
Military AN/GRC-9 Radio Receiver Transmitter
9:06
German WW2 100W.S and Torn.E.b on 630 meter ham frequency. 475 kHz
9:03