Hello Henry.
24 Sep 97 02:21, Henry Edginton wrote to Rob Dennis:
 HE> I have a 15.5 foot boom 11 element beam now,What I am refering to is
 HE> the high gain omni's like diamond 500,Sinclair and like the station
 HE> master used for alot of repeaters.I have tons of stuff on beams
 HE> however i am also looking for a program to design qubical quads for
 HE> vhf & up for 5 to 20 elements.I have seen nothing at all anywhere on
 HE> high gain omni's & that surprises me.
I don't remember which one, but there's specs for a 12dbd gain omni in the 
ARRL handbook.  I don't have the specifics, but the antenna is designed 
around stacking dipoles.  For every dipole you add to the antenna, the more 
gain you will get.  That's the basic premise behind the Super Station Master, 
Diamond 500 and any other high gain omni.  For each 1/4 wave dipole you add, 
as I remember the gain was up by 3dbd...
I built one a few years ago and it worked well.  The antenna itself is 
constructed using RG8 coax, cutting to 1/4 wave lengths and soldering them 
all together in a vertical mode.  I put mine into a piece of PVC pipe and 
used it for a while on my backup repeater that I keep in the garage.
... Alcohol: Drink that makes the opposite sex look better...
---------------