quote:

NG56 In the bands 72.0-73.0 and 75.4-76.0 MHz, the use of mobile

radio remote control of models is on a secondary basis to all other

fixed and mobile operations. Such operations are subject to the

condition that interference will not be caused to common carrier

domestic public stations, to remote control of industrial equipment

operating in the 72-76 MHz band, or to the reception of television

signal on channels 4 (66-72 MHz) or 5 (76-82 MHz). Television

interference shall be considered to occur whenever reception of

regularly used television signals is impaired or destroyed, regardless

of the strength of the television signal or the distance to the

television station.

quote:

(e) Non-Federal services operating on frequencies in the band 25-50
MHz must recognize that it is shared with various services of other
countries; that harmful interference may be caused by skywave signals
received from distant stations of all services of the United States and
other countries radiating power on frequencies in this band; and that no
protection from such harmful interference generally can be expected.
Persons desiring to avoid such harmful interference should consider
operation on available frequencies higher in the radio spectrum not
generally subject to this type of difficulty.