John Portune (W6NBC) gives the SNARS member a presentation on the development and use of slot antennas for ham radio. You can download a copy of John's e-book on Amazon at: a.co/5mBFo5p
I've run resonant (no tuner) Hentenna / Skeleton Slot galvanised fencing wire antennas on 160,80,40,20,10,6,2,70cm and 23cm for ten years, and there's a lot you've said that I'd disagree with. I agree though, the Slot is a remarkable antenna with big performance. I did the cube antenna, but formed in a circle instead - this does go very well. The biggest lesson I learned was the antenna is nothing if it's not resonant - attach a tuner to a non-resonant at your peril - an ordinary half-wave dipole outperformed it if I did. The 160/80/40 slots can be built inside each other and fed with one feedpoint for a jaw-dropper of an antenna - I mount mine with all four corners equal height above the ground, a cloud warmer as you put it, but it seriously outperformed any other DX wire antenna fullstop, as well wound any NVIS local stations' S-meter right off the end of the meter and caused many a disbelieving moment, especially with full legal into it.. Strongly encourage anyone to try this antenna - practice first with a six meter Hentenna since it is only the size of the hood of your car, and once you have the hang of it then progress on to a 40m slot, and then to 80 and 160, and watch the insanity... A word of warning, the Hentenna / Skeleton Slot is going to teach you how to use your analyser, this is a hard task master, as you will see. Rules of thumb - narrower slot is lower impedance, longer antenna is lower frequency, height above ground should be about the same as a yagi reflector distance.
I've run resonant (no tuner) Hentenna / Skeleton Slot galvanised fencing wire antennas on 160,80,40,20,10,6,2,70cm and 23cm for ten years, and there's a lot you've said that I'd disagree with. I agree though, the Slot is a remarkable antenna with big performance. I did the cube antenna, but formed in a circle instead - this does go very well. The biggest lesson I learned was the antenna is nothing if it's not resonant - attach a tuner to a non-resonant at your peril - an ordinary half-wave dipole outperformed it if I did. The 160/80/40 slots can be built inside each other and fed with one feedpoint for a jaw-dropper of an antenna - I mount mine with all four corners equal height above the ground, a cloud warmer as you put it, but it seriously outperformed any other DX wire antenna fullstop, as well wound any NVIS local stations' S-meter right off the end of the meter and caused many a disbelieving moment, especially with full legal into it.. Strongly encourage anyone to try this antenna - practice first with a six meter Hentenna since it is only the size of the hood of your car, and once you have the hang of it then progress on to a 40m slot, and then to 80 and 160, and watch the insanity... A word of warning, the Hentenna / Skeleton Slot is going to teach you how to use your analyser, this is a hard task master, as you will see. Rules of thumb - narrower slot is lower impedance, longer antenna is lower frequency, height above ground should be about the same as a yagi reflector distance.
Would love to see some of your antennas. Got a link?
@@dougtaylor7724 If you want to see one, then build it.
Make a video.
@@nealbeach4947 make an antenna
Thanks, Mr. Portune, This video really helped me. The horizontal polarization’s lower noise property appeals to me. KC3JJH
The vhf/uhf slot antennas mentioned as being on the concorde at 4:24 were in fact HF notch antennas. Also used on the DC-10.
Ever cool and educational. Thank you
Hentenna = portmanteau of hen (変な) and the English antenna meaning "strange antenna" in Japanese. Really interesting video thanks!
Yeah... I bought the book.
How about a slot antenna for 80mts
Do it. Goes well. I've made lots.
The slot antenna, if you really look at it as a folded dipole! The RF current is traveling in the inside, using the skin effect of RF,
March 2016 page 37 in QST
Also You can Make a Biquad Slot Antenna,
It's two diamond Quads cut on a Piece of Metal,
I like to Make if these for My SDR Play RSP DX Receiver!