On 7/20/2011 5:43 AM, Andy wrote:
On Jul 19, 9:31 pm, Eric wrote:

I'm hoping there is some way to adjust the Rainco antenna without
cutting off pieces of the whip, which has a nice ball formed on the end.


I'm sure that if you open it up there will be a way to adjust the
length without cutting the tip off. I thought I had the same antenna
as you but my sleeve is larger diameter. My measurements a

sleeve dia 1.25 inch
sleeve length 26.2 inch (insulator to base excluding mounting bolt)
exposed whip length 44.7 inch

Don't know the resonant freq or the SWR at 123.3 but I may have to
measure it now you brought the subject up.

It appears the antenna can be opened by removing a single screw that
attaches the mounting base to the sleeve. The insulated cap at the
top of the sleeve is retained by staking (center punched indent).

I have a vague recollection that these antennas originated in AZ and
were designed by Ryan. Quite a few club members were using them a
while ago. I did a search of some ham radio antenna deign sources but
didn't find exactly the same design. Sleeve monopole is the best
generic description I could find.

If you open it up let me know what you find, and/or send pictures.

Your measurements are exactly what mine measures, so I think we do have
the same antenna. It's the motorhome's antenna, so I'll wait until after
our upcoming trip before trying to open it up. Don't want to fix
something that's working well just before I need it!

--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to
email me)

- "A Guide to Self-launching Sailplane Operation Mar/2004" Much of what
you need to know tinyurl.com/yfs7tnz