Camera 2 & 3 give inconsistent signals. Sometimes I get a picture, sometimes I get "no signal" message on my tv. I always seem to get good reception in the evening.
Because of the structural difference in homes, there is no one-way that works for everyone. However, with a little trial and error
the cameras will work. Could you describe your set up a little better (distance, obstructions, etc)?
The 1st place to start is with (carefully) adjusting the directional patch (little square) antennas on both the cameras, and the video receiver. My favorite tips are:
The audio/video signal will past much easier through windows, then walls (floors are often easier then walls also).
Because walls can often deflect the audio/video signal I use a corner in one room to direct the video signal(s) to, and then direct the receiver antenna to the same corner.