this post was submitted on 07 Jul 2023
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Definitely can be done on a budget. As others mentioned, you do need a license, but study materials are free. The Technician license is the most basic.
Generally there will be an amateur radio club around most areas -- I'd do a search for your area. If there is one near you, and especially if they hold physical meetings, just get involved!
An SDR (software defined radio) is likely the cheapest way that you can start listening (not transmitting), and that can be helpful to hear how people communicate. Again, do a search and see if there are radio nets local to your area. The most basic antenna is a long strand of wire!
And finally, just a heads up: ham, not HAM. Contrary to popular belief, it isn't an acronym for anything.