[hvalentim]

Thanks a lot for your comments as they did draw my attention to a number of things. Getting to have a notion of the different matters at stake such as in meteoestarreja's "lecture" is part of the fun.

Actually I am pretty sure any of the models will work. Because I will have the receiver perhaps 5 meters underneath the transmitter, close to a window. But of course the big advantaged of doing things by yourself is that you can always try to insure it will be done right and you will get the best possible results out of every penny spent. Who knows, perhaps tomorrow I decide I want to place a second TX 20 meters away with a bunch of walls in between.

All considered, right now, performance wise, I am inclined to think that the most secure value may very well come from picking a portable hamradio antenna.

Something like this:


RH701 SMA-M SMA-F BNC VHF/UHF Dual Band Radio Antenna 144MHz/430MHz

Perhaps a clone of the Diamond original?
"RH701: 144/430MHz(2m/70cm)
Length:21cm / Weight:30g
Max.power rating:10W FM / Impedance:50ohms
Type:1/4wave(144/430MHz),120/150/300/450/800/900MHz for receiving only"

I am just wondering if it will perform well with the comparatively low transmission power of the Superheterodyne 3400 RF Transmitter - 25mW (315MHz at 12V).

Also assuming that it can easily get to work 3MHZ above (RX/TX), with the 433Mhz.

Do you see any caveats?