The guys over at QRP guys are really pumping out new products as of late.
I noticed when perusing their site the other day a new antenna, currently listed as under development. Its a trapped 20-30-40 meter end fed antenna with a built in N7VE LED circuit.
I’ll probably be purchasing this guy as well. The kits are fun to build and the more recent ones are very functionally designed. It would be nice if they diverged from the 20-30-40 meter bands every now and then though!
Heinz’ design does not require any adjustments for a decent SWR in a wide range of configurations and over varying types of ground. I really do not see how the new proposal is in any way superior over these existing designs.
If you don’t want to build it yourself, hamshop.cz (@OK1CDJ) has a similar antenna readily made for ca. 25 EUR:
… although the total length of 20m seems a bit untypical despite the traps … but the most important are the promised SWR values (…), regardless of the arrangement (Inv-V, Inv-L, stretched, vertical, …) and height above ground, hi.
Barry, I also noticed the instructions left a bit to be desired and had already dropped an email to the QRPguys about it. I personally have no problem building and resonating traps, but I agree it should be addressed in their directions.
I assume they use a little lower inductances (same as the tiny traps from SOTABeams), so the pure radiator will be ca. 18.x m long (as compared to the ca. 16m in your design), and the specified length of 20m might include a piece of rope at the end.