Quote Originally Posted by Ioannis View Post
Why not put 2 MARs in series to amplify the Transmitter signal?
I've tested with 3 MAR-6 on the receiver end just to see if it would work. It did, but you can easily overwhelm some receivers.

At much higher frequencies (~300MHz), many people have reported this tip http://davehouston.org/passive.htm worked for them. One fellow with access to a lab, measured 10dB gain in all directions. Most small battery powered transmitters have very inefficient loop antennas formed by a PCB trace. Their range is frequently poor and this can make quite a difference. I have no idea whether it might work (or be at all practical) at longer wavelengths.