Who at the FCC told you there was nothing you could do? Did you check with the Spectrum Enforcement Division? See their webpage at http://www.fcc.gov/eb/sed/
Written complaints are always better than telephone complaints. That should give you a starting point. If you don't get a response, send a handwritten note to your congressman. Handwritten notes are given more attention than email or typewritten notes. You should also make an audio recording with a tunable reciever in the bands of interest. That may help determine the actual source of the interference. All radiators must comply with FCC regulations, and if they are causing interference outside thier authorized band, you should have a valid complaint. If the FCC won't listen, contact a lawyer. If you have a club member that's a lawyer, even better.

Is the interference across all channels, or only on specific channels? Note that if its just interference with other flyers operating close to your field, they are operating in accordance with FCC regulations, and the FCC won't do anything. If its a television station, telephone relay, or powerlines, you should also contact the owners and let them know about the problem, and CC them on any written correspondence to the FCC or your congressman.

Brad