Alex Pettit’s Instructions for making an umbrella antenna and cakepan loop hydrogen line feed:

Alex Pettit’s Instructions for making an umbrella antenna and cakepan loop hydrogen line feed:

https://www.astronomy.me.uk/wp-content/uploads/2026/04/Alex-Pettit-constructing-umbrella-antenna-cakepan-loopfeed-acc-170426.pdf

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