I believe most satelites operate in the microwave range, which is around 1 to 40 ghz. 1 ghz has a wavelenght of about 30cm. Some operate all the way down in the HF Band. The lowest active sat I know of operates around 28mhz( wavelenght=10 meters). Sputnick operated around 14 mhz or 20 meters.
This website has an excel sheet with all the sats out there. Doesn't give there frequencies though.
http://www.ucsusa.org/nuclear_weapons_and_global_security/space_weapons/technical_issues/ucs-satellite-database.html
some wiki stuff
http://en.wikipedia.org/wiki/Microwave
http://en.wikipedia.org/wiki/Satelite
Here is a very small list of freqs
http://www.zarya.info/Frequencies/FrequenciesAll.php
This site tells what band a few sats are on
http://www.flysat.com/satlist.php