Getting on 6cms amateur tv could'nt be simpler, you can build a receiver & transmitter from modules currently available on Ebay, a simple transmit / receiver can cost as little as £75 !! the picture below shows a simple system built by G0ATW.
Portable 5.6 ghz station built by John , G0ATW
Building a 5.6 GHz Station
Firstly have a look at the BATC Wiki, a great website with loads of information , also http://www.5-6ghz-atv.co.uk/ is worth a look.