You can build your own antennas and test them, you can build transceiver if you really want. Hobby is not about talking with people, that’s just convenient way

You can build your own antennas and test them, you can build transceiver if you really want. Hobby is not about talking with people, that’s just convenient way of testing your gear and knowledge of electromagnetic fields to have person from the other side to tell you how well they receive your signal.