SDR has started me on the path of exploring the radio spectrum, I encourage anyone who is interested in radio who has not tried it to get a cheap SDR dongle and give it a spin.
That's what got me into amateur radio - with your SDR you can receive signals from the ISS repeater, and watch the frequencies change due to the Doppler effect.
A lot of publicly available websdr's have a limited frequency range due to the hardware used, or political reasons, I wound up buying a limesdr myself because nobody nearby has the ranges I want.
