[Mobile-Portable] Thoughts on inverted "C" on car?

Tue, 9 Mar 2004 13:17:30 -0500

I haven't completed the project yet, but I bought a Crappie Pole (16')
from Wallmart for about $20.  I plan to create a bumper mount that can
support it.  While I am experimenting with solid aluminum wire, you
might try with copper, but I plan to run the wire from the mount thru
the top loop on the antenna, use "guy string" to pull it towards the
front bumper as I have seen military jeeps use in the past (One wire to
left front bumper, one to the right forming an inverted vee with the
string.)  The whip will be pulled down enough to be legal on the
highways and maybe just a few inches more.  This will give me a full 1/4
wave on 20 meters.  Since I am not using a tuner, I am wrapping some of
the wire around the base near the connection with wide-spaced coil.  The
pole is about 1 1/2 ft short.  

I understand that there are also 20' crappie poles by the same
manufacturer, but Walmart doesn't sell them.  With a 20 Footer, I would
not need the coil.  Since you have a tuner, you would have a great all
band antenna.

Buck
NA4FM

> -----Original Message-----
> From: DavidE Benedict [mailto:[email protected]] 
> Sent: Tuesday, March 09, 2004 1:08 PM
> To: [email protected]; [email protected]
> Subject: [Mobile-Portable] Thoughts on inverted "C" on car?
> 
> 
> You guys have a ton of good experience. Great to see these reflectors.
> 
> I have installed an Icom AH-4 tuner and it works 80-6m using 
> a 102 inch whip which is mounted atop the rear corner of my 
> station wagon roof. I got the grounding problems taken care 
> of. (By the way, I mounted the AH-4 on the headliner in the 
> old stationwagon/hamshack, positioned directly under the whip. 
> 
> My thought now is to mount another metal pole 
> (insulated/unterminated) at the front bumper area and string 
> a wire between their tops just to get more wire in the air 
> and to maybe tune 160m. My total "wire" length of the 
> upside-down "C" would be about 25-30 feet.
> 
> I suspect that there may be a better/lower take-off angle but 
> also that I may incur some marked directionality. If it has a 
> marked directionality I could maybe use it only when parked/mobile....
> 
> Any thoughts about this scheme?
> 
> Anyone try this before? Modeled it?
> 
> David
> w7dbh
> 
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