160-260 kHz AM
540-1600 kHz MW

Jupiter: 40MHz to a few khz
jovian storms: 18-28MHz
ham radio: 18,21,24,28MHz
ionosphere absorbs < 18MHz
solar bursts: 18-200MHz

sun + galactic ctr: 433MHz = 69cm

milky way wvlength: 1.83m =163MHz

hydrogen: 1428MHz = 21.11cm

c = 3x10 ^ 8 m/sec
Wvlength (m) = 300/Freq(MHz)

squarelaw detector -> digital voltmeter -> rs232 interface to pc

disconnect aerial in electrical storm.