If all you need is a PA system in several building then why not just use a transmitter and a bunch of receivers connected to each buildings amp. If you need to be inexpensive use a FM radio band transmitter and FM radios for the receivers.

the cheap way


Merritt

Business Telephones & Equipment + Commercial Audio/Video Products
Commercial Communications . . . Turner, Maine
If it was built after 1980 don't expect it to work right.