A week ago we discussed magnetic loops for 144 MHz. Today I'll demonstrate mine. I'm using WSPR transmitting from the middle of the city. There's buildings all around me but I'm still getting through. Demonstration in this video.
PS: WSPR is just one aspect of stuff you can do with QRP or low power amateur radio. For ideas on other factets of amateur radio that low power works with, check out Minimum QRP. Available in ebook or paperback thousands have been sold around the world.
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