[werk_ag]

MeteoEstarreja is our expert in radio matters, so the only thing I can add is my practical experience with some type of antennas.



I never tested it. I have similar models, with metal SMA connector, and it's my prefered antenna for TX units. Also works very well for RX



I don't know why, but this kind of antenna seems to not perform well for transmitter. Works fairly well for receiving.
There are other type, without the coil in the middle, that its very good for receiving (even with a 3m cable), but also not perform well for TX.


I never tested one of those.

There are also this type:



I'm using a lot of them on my WD units, and one in my second TX unit. They perform well for TX and RX. Inside, they just have a small coil.

and these... they are cheap, and perhaps they work well, but I don't know. Someday I will order some units for test.