I have one Receiver and 4 cameras setup, By facing the transmitter on the camera towards your receiver, then Your receiver (all on the same code under the cap) facing either 90degrees from all cameras or facing Strait up to the sky.
on a side note, TVs, PCs, Monitors and such can interupt signals. Placing the receiver for your cameras as far from these Interferences as possible will help too.
also, If your not getting a good signal from one of the 4 codes, try another one.
what other 2.4Ghz Products do you own?