On Tue, 14 Oct 2008 03:04:04 GMT, "Jerry"
wrote:

I dont expect the array of
the 8 or 10 alternating coaxes to be controlable in either VSWR nor beam
squint. But, it might be fun to try building one and try it.

Hi Jerry,

Fun, maybe, but one can expend the same effort more productively and
still have as much fun.

73's
Richard Clark, KB7QHC

Thanks all for the input.

I agree, making that multielement antenna without any means for
measurements is taking a risk that it will be quite inferior to a pro
antenna and thus a waste of time. I found coaxial multielement
antennas at procomm.dk. Length is between 70 cm to 535 cm.

So I back down to a hopefully more humble project. That would be
taking a commercial mobile antenna wip of a 1/4 WL plus !/2 WL
(Smarteq.com). It has a phasing coil inbetween. There is a side mount
with a coaxial FME connector which could be used for a coaxial antenna
with a quarterwave sleeve. The protruding wing (stopper) of the side
mount would be taken off. It is then posible to slide a 1/4 WL Cu tube
over the antenna mount. By fastening the tube to mount ground, one
would obtain the sleeve needed for a coaxial exended antenna. Gain of
the whip in a ground palne confguration is 3 dB.

Should a sleeve +protruding part of mount be eaxtly a quarter
wavelength long at a velocity factor of 1 - or 0.95 ?