Below are listed some examples of frequency bands used by Radio Astronomy. The link below the list shows a lot more (from the SETI site). SETI stands for Search for Extraterrestrial Intelligence). More explanations for these frequencies can be found on this page and on the “Radio Astronomy” main page (see left column for link).
Channel 37 National Radio Astronomy Quiet Zone 608 to 614 Mhz
Hydrogen 21 centimeter line 1420.40575177Â MHz
“Wow! Signal” discovered at 1406 & 430 Mhz
OH Hydroxyl Radical 1606 - 1722 Mhz
Water Vapor 183 Ghz
Ammonia (NH3) 23 Ghz
Complete list of significant frequencies and allocated bands for Radio Astronomy