Thanks Mike. Your observations about radiation angle and performance
are in good agreement with my modeling. Yes, the secret sauce is that 43
ft is 5/8 on 20M.
73, Jim K9YC
On 9/3/2013 11:17 AM, mikefur...@att.net wrote:
Hi Jim,
I use exactly that here in Tampa. My antenna is a stealth 43' of green
18 gauge wire up a tree and 43' of the same horizontal hidden in the
bushes. I am in an apartment. The feed point is about 10' above
ground. I feed it with open wire line from a 4:1 balun on the back of
my K3 with the internal tuner. I am guessing the feed line is about
25'. It matches on 80-6 ... sometimes ... excessive rain causes a
"HIGH CURRENT" on the radio and I just back down the power until it
goes off.
I did tinker with different lengths of coax between the balun and the
radio ... 10 feet of RG58 and the best SWR on 20 was 2:1 and 6 meters
would have nothing to do with it. I have not experimented with the
length of the open wire line ... the set up seems to work fine as I
currently have it.
43' is a popular height because it is 5/8 on 20 and can provide "3db"
gain. For me the antenna works very well on 40, 30, 20 and 17. It is
very poor on 80 and the angle of radiation is a bit high on 15-10. I
have worked locals on 6 (use a 6 m delta loop in attic the rest of the
time). On 160 the tuner would have nothing to do with it. BUT on 160
during the Stew Perry I did add a base loading coil and hid 1/4 radial
in the bushes and worked up and down the East coast plus VEs and
Carribian.
My current goal is DXCC on RTTY and only confirmed on LOTW. With this
set-up and I am up to 65 countries with only 100 watts.
Hope this helps.
73, Mike WA5POK/4 Tampa
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