[Scott Dorsey]

wrote:

Exactly! I'm at a small arts organization that, between two buildings,
own 10 UA series Shure wireless units (700-800 MHz) and need to know
if I can still use them in my theater (inclosed, lots of steal, very
few hits from convention center right below us).

That is part of the frequency band which has been reassigned to public
service use. Six years ago the announcement was made that this band was
going away.

If you get caught interfering with public service facilities, a lot of
people get very angry. Of all the frequencies to squat on, this is almost
as bad as aircraft navigation frequencies and probably worse than most
military comms frequencies in terms of the consequences if you are caught.

Do I need to buy
something else if I get "caught" using the old mics or do I have to
rent every time a client ask for wireless?

If you get caught, folks from the state or county radio department
will come with police officers and take your devices away, and then
you will need to buy something else. The chances of this happening
are pretty slim because there's a lot of bandwidth up there, but the
consequences are not good.

For the meantime, I would suggest renting equipment until the whole
mess is straightened out. But if you're going to use frequencies
without proper licensing, stay away from public service bands.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."