Every entry below is a concrete way to interact with satellites, radio telescopes, or spacecraft as a hobbyist — listening to a signal, driving a remote instrument, joining a ground-station network, pulling open data, or contributing compute to citizen science. They range from free, browser-only tools you can use in the next five minutes to institutional ground stations you'll never realistically book — and the catalog is honest about which is which.
Each card is tagged so you can filter to exactly what fits your budget, legal situation, and skill level. Receive-only entries need no license anywhere; anything that transmits does. Click any card for the full detail, cost breakdown, and source links.
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