"David G. Nagel" wrote in message
...

FCC part 15 regulations specify that a low power am transmitter can not
exceed a very low power level ( I don't remember off hand how much)

http://www.access.gpo.gov/nara/cfr/w...7cfr15_06.html

PART 15_RADIO FREQUENCY DEVICES--Table of Contents
Subpart C_Intentional Radiators
Sec. 15.219 Operation in the band 510-1705 kHz.

(a) The total input power to the final radio frequency stage
(exclusive of filament or heater power) shall not exceed 100 milliwatts.

and the antenna must be attached to the transmitter and must not exceed
about 5 or 6 feet.(b) The total length of the transmission line, antenna
and ground
lead (if used) shall not exceed 3 meters.