Refer several Silicon Chip article sbaout these units & pix etc at resource site =><A href='http://www.picaxe.orcon.net/nz' Target=_Blank>External Web Link</a> www.picaxe.orcon.net.nz Ranges with a simple ~6dB "cotanga" Yagi were hundreds of metres, but you may find the Jaycar Rx not brilliant & need to to experiment.