Like all sorts of small antennas, these are a compromise. On the higher HF bands, when used with a good ground or counterpoise, they can be quite effective, being within a couple of S points of a full sized dipole. I used mine with a central heating ground and worked some remarkable DX on 10m SSB QRP. They fitted directly on the back of the rig and were very easy to tune.
I suspect mine is in the loft as I have not seen it for 7.5 years! I am too wobbly these days to go up there!
See https://sites.google.com/site/g3xbmqrp3/antennas/mwhip .
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