Okay after speaking to Bluestreak007 and looking around, i think i may have found a cheap way for a decent Wireless AV setup.
just tell me what you guys think?
I already have a 900mhz system that i have been unsuccessful in getting to work on my area (mobile phone network used 900mhz GSM) but the 1.2Ghz system seems to be reasonably clear with the odd computer wireless system using that frequency. its not really legal but its the best i can come up with with out going 2.4G or back to 5.8G. Or i could go the wifi like Dimitris76 has suggested but i would not even know where to start. seems very complicated to a newbie like me. at the moment i will be happy with around 700m maybe push it to 1km but with the system above i hope i will easily make that, but yes any suggestions or comments are welcome