[JoeDaDude]

There is lots of cool science to be done with radio, being done by amateurs. Starting with the Society for Radio Astronomy mentioned already, but also see:

http://www.radio-astronomy.org/

SARA members have a lot of projects going on, from beginner stuff to full blown SDRs http://www.radio-astronomy.org/projects

Radio Astronomy Software Defined Radio (RASDR): http://www.radio-astronomy.org/rasdr

SuperSID: Sudden Ionospheric Disturbance monitor: http://www.radio-astronomy.org/node/210

Radio Jove: Radio emissions from Jupiter: https://radiojove.gsfc.nasa.gov/

Personal Space Weather Station: http://www.hamsci.org/basic-project/personal-space-weather-s...

Reverse Beacon Network: http://www.reversebeacon.net/

Weak Signal Propagation Reporter Network: http://wsprnet.org/drupal/

PSK Automatic Propagation Reporter: https://pskreporter.info/