Do not know SAwireless. However, there is a company called High Site Rental's from which we used to rent space on existing approved sites. Must warn though that you should insist on impact study approval certificate and ensure that the other wireless equipment existing on those sites will not interfere with what you are planning to achieve.
Sure, give me a call so we can speak, we do have equipment setup in Harties and Warmbaths.
My contact info is 0827665624 and email is [email protected]