There is one antenna that works like a charm and will stay up easily – which are the two most important things when building a remote mountain QTH station. The width of the antenna would be pretty much a half wave on 80M and the height would be at least 60′. You would have two of these in the trees – one pointed SE – NW and the other NE – SW. You would cover most places in the world – certainly the last two I need – hi hi. This ends up being an Extended Double Zepp on 30M, two half waves fed in phase on 40M (but would perform like a dipole) and you would have decent gain on all of the high bands.
In fact, on 30M it rivals a Moxon or 2 element yagi gain wise. On 80M its a cloud warmer, but you could build a switch like I have in the past – that combines both legs of the ladder line and feeds them against elevated radials (elevated so critters won’t trash the radials). OR – bury them and let the leaves and other falling branches and whatnot cover em’ up.
If you did have this switching arrangement – you would have an omni directional vertical on 160M and 80M. Since that’s easy to imagine, lets start with patterns for 40M and above, and for 3Y0Z – 40 – 20M are most important, but there is a chance 17 and 15 will open up – especially if you are on the East Coast:
40M – its a dipole – “decent enough”
30M – its an EDZ . . .
And there are two side lobes – which is the classic pattern of an EDZ. Rudy, N6LF describes how to optimize this antenna:
But because we want multi band antenna that is simple and will stay up, we won’t go that route.
You get 3 dB gain on 30M, 1 dB on 20M, 2 dB on 17 and 15M. I doubt 12 and 10 will be open during 3Y0Z and beyond, but you get gain there too. You get really nice low takeoff angles 30M and above – and DX enough on 40M, so if you are on a hill and beaming toward 3Y0Z – you win! You also get 160 and 80 – as long as you do this:
I have several ways to keep that antenna up:
- Its important how you solder the center insulator
- Don’t use rope that squirrels can eat through at the end supports
- Cement a redwood fence post in the ground at the center of the two crossed zepps and use something like this to keep the ladder line from tangling or whipping around too much:
This antenna is what I used for my first 300 DXCC entities, and I only had it up 40′. At 60′ and above its a GREAT antenna.