Also in the diaries of many OK and OM stations is the brand 7J4ALL. The answer to why this is so is given by the following video with a demonstration of the antennas of this station.
Antennas 7J4ALL
Predošlý článokAMSAT-DL online sympózium
Nasledujúci článok VHF antenna F8KGU according to YU1CF
You could take another look
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