Instead of telling you how stupid your question is - I will refer you to the FCC web site - Part 97.....

Part 97 says - no unauthroized transmissions - hence if you cannot ID your signal, you cannot transmit anywhere except 11 meters.
11 meters you are limited to no more then 3 watts AM or 12 watts PEP SSB..
No digital modes and no repeaters on 11 meters.

Second off - if licensed as an amateur - you have to follow the band plan.
You can't just pick a frequency that sounds quiet and start operating.
One amateur recently was fined for operating on 350 Mhz band, I think his fine was around $12,000.00

Third - you would need to limit your transmit power to no more then 1500 watts PEP, and you would have to have the equipment no only to measure the transmit power, but also to do a field survey - since if you had neighbors, you would have to test the exposure limits in the neighborhood.

Your records would have to be kept of when you operated and available for review by the FCC - should they come knocking on your door.
Most of the band specturm is being used for one thing or another and just because you think that it is high enough that no one would hear you, doesn't mean that someone isn't using it for something legally / commercially..

http://www.arrl.org/part-97-amateur-radio

http://www.ntia.doc.gov/files/ntia/p...3-allochrt.pdf