The QRPer Board

not totally sure, since I'll need to run more verifications, but I believe that it may be worth trying a 16:1 in place of the 9:1, the resulting SWR curve may possibly become more "flat"

Thank you, on monday will put together a NEC model, I'm curious about the pattern

length of the V/U antenna ?

what's the length of the other antenna, and which band you made the contacts on ?

Here's what I got from 3 different EFHW setups this weekend Interesting, but having the R/J (resistive and reactive) values and/or the impedance value would have been more useful, since with that one could be able to find out a better tranformation ratio for the UnUn, just to make an example, playi...

I'll give it a go if we get some clear weather this weekend! That should be interesting, my suggestion is to start with one of the "recommended lengths" and analize it to obtain R/J at various frequencies (bands), at that point one may either act on the length or (probably better) decide ...

Folks, I've had this idea floating in my skull for some time now... but currently I don't have a VNA available, so I'm asking if someone ever tried what follows When it comes to EFRW antennas we're still following some rather old and established rules about the radiator length and the use of a 9:1 t...

well, yes and no; a reference table or "calculator" will help avoiding some lengths which won''t "load" on some bands, so it's useful, then one may want to use an EFRW at home, so a reference may and probably will be useful :D As for lower bands (say 80m) then it's mostly about c...

As for the EFRW radiator (wire) length, the "calculator" found here

https://k7mem.com/Ant_End_Fed.html#Not_Random_Multi

helps selecting a proper length depending from the desired bands

just an additional note; a workaround to such issue is to either use a 10m halfwave on lower bands, down to about 20 meters, accepting the obvious performance penalty, or set up the antenna as an inverted L