These are 'bow tie' antennas. A double quad fed as the corners looking a
bit like a figure of 8 and space above a copper reflector. Gives me over
9dBi gain and excellent bandwidth. I use them on their own or as the feed
to a simple large mesh reflector system, a section of a parabolic dish in
fact.. The 23 cm version has quads of 56mm sides. The reflector is 17cm x
23cm of single side copper clad fibreglass. 13 cm version is directly
scaled down in size. See http://www.w6pql.com/23cm_double_quad.htm but mine
does not have mesh reflector but the copper clad board instead rather like
http://www.vhfman.freeuk.com/radio/23cmantennas.html.
Dick

"Merlin-7 KI4ILB" wrote in message
m...
Is it a yagi? What size are they?
Joe

"ferrymanr" wrote in message
...
I have home made antennas for 23cm and 13cm ATV. These are made mainly
of
copper, Copper clad fibreglas PCB material and 3mm diameter silver plated
wire with silver plated N-Type connectors an solid copper coax. I want
to
protect them from corrosion etc. Is there a paint, varnish, laquer etc.
(ideally an aerosol type) that I can use which will not introduce losses?
If someone can give me guidance as to what base type - for example
acrylic -
I should use it would be most helpful. I am always wary of the sprays
supplied for spraying vehicles but these seem to be the most commonly
available.
Thank you
Dick G4BBH