You won't have aproblem with bothering other services but I suspect if you lived
on the coast your assistive device might potentially pick up some unwanted
signals. I don't have a specific frequency chart in front of me so can't answer
that question off the top of my head and don't have the frequency charting for
the alds where I'm typing.
Tom
Tom Brennan KD5VIJ, CCC-A/SLP
web page http://titan.sfasu.edu/~g_brennantg/sonicpage.html