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SHUNT FEEDING A
HUSTLER 40 METER MOBILE HF ANTENNA
BY KC8SGO MARK
GET A BETTER MATCH AND A BIGGER
"Well, it's not my invention by any means - comes from
ARRL Antenna Handbook.
It's known as shunt feed, and is quite
I use a Hustler MO-3
mast, and RM series resonators, on a ball mount off the left
rear fender of the station wagon. I could not get a match below 1.7
to one until I built this. Now I get
1:1 at my frequencies of interest and considerable useable
The coil is 20 turns, #12
solid, 1 & 1/4 inch I.D. ( closet hanger dowel works great ) spread to
5" long, ( thats 4 turns per inch ).
One end to feed point, other to
Clip lead from ground taps up the coil to adjust the
inductance used. Eight turns works perfect for 40m, and 4 turns for 20m.
Mind you, this is on a wagon - results will vary on a sedan. It works best
on a ball mount on a fender, but can be adapted to other
I have no camera for pictures
for this page but if you get a ARRL Antenna
Handbook, it's in the
chapter on mobile antennas.
it!!! - From 7.240 to
7.270 my SWR is below 1.5 to 1, and it's flat at 7.258 ( MIDCARS
). Perfect for the
(see link below) and all the other
groups I hang with. On 20m, flat at 14.275 and I cover the entire
general phone segment with SWR below 1.5 to
I have yet to try 15m ( no resonator ) or
10m. I have an RM-10, just haven't gotten 'round to
Made a noticeable difference compared to
the straight setup - both on TX and RX.
Hope this helps.
See ya on the 1721 RTG
CHECK OUT THE 1721 HF ROUNDTABLE GROUP
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