[net.ham-radio] UHF Collinear-Coaxial Antenna Help

philb@shark.UUCP (Phil Biehl N7FWL) (08/27/85)

	I am looking at this type of antenna to use as a base/repeater
	gain vertical and would like to communicate with some one who
	has experience and/or knowledge about building these babies.

	My sole source is an old ARRL FM and Repeaters Manual and the
	diagram describing it is for a single halfwave array. I would
	like to add more sections to increase the gain but do not 
	understand how this is accomplished. The diagrammed array 
	from the bottom to the top consists of: a 1/4 wave stub (for
	reducing feedline radiation), a 1/4 wave section, a 1/2 section,
	another 1/4 wave, and finally a 1/4 whip at the top. What I want
	to do is to add more sections for a higher gain figure but do
	not know which sections to duplicate. Do I add just more 1/2 
	wave sections or do I need to add 1/4 wave sections along
	with the 1/2 wave sections?

	Any and all help appreciated. TNX

	73
	Phil Biehl, N7FWL
	503-685-2122
	tektronix!shark!philb