In a message dated 3/9/2011 12:01:25 P.M. Pacific Standard Time,
towertalk-request@contesting.com writes:
> Im really confused. Id like to buy Local, because the mail order
houses have
Really high prices and high shipping
plus they only do 5 or 10ft intervals.
> I have a Glen Martin 9ft roof mount tower. Its just shy of 4ft from
the rotor
to the top of the tower. Right now I have
a 2 1/2" Fence Post mast (really heavy wall) that I hold an A4S up with.
> A4 is going bad so I decided to get my dream antenna the standard
SteppIR 3
element beam and nothing else will go on the mast. I would
like to get 8ft as that will give me 4ft above the tower, I can put the
antenna
at 2 - 3 feet and be ok.
Hiya, Scotty --
The 3L SteppIR isn't appreciably bigger than the A-4 you're currently
using. Go ahead and use what you've got.
If you want to go a little higher, use 1.5" galvanized pipe (that's
the ID measurement - the OD is 1.9"). The SteppIR U-clamps are very snug for
a 2" mast so they'll work FB on a 1.9" piece of steel.
The main factor is that it's going on a roof-mounted tower. The tower
will likely blow off the roof before the mast (whatever it is) bends.
Cheers,
Steve K7LXC
TOWER TECH
and
_www.championradio.com_ (http://www.championradio.com)
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