Not an expert here, but I have some experience w/floodcams (wireless video input to iwitness from within AHP). The wireless transmitters on the camera and wireless video receiver have VERY directional antennas, that are labelled something like "point this side in the direction of...". The other "gotcha" is that they share bandwidth with 802.11x wireless ethernet products in the 2.4Ghz range (and phones and ...) Maybe a couple things to check...Are you running a wireless ethernet computer network? If so, try turning off the radio for a bit. Can you hookup just one cam with transmitter and receivers pointing directly @each other. Hope this helps.