----- Original Message -----
From: "Goofball_star_dot_etal"
Newsgroups: rec.audio.opinion
Sent: Sunday, June 26, 2005 2:25 PM
Subject: FM Antenna Resources


On Sun, 26 Jun 2005 13:11:02 -0400, "Robert Morein"
wrote:


The Yagi is a wideband,
********! (5)

Low gain design.
********! (6)

It does appear I have to make a clarification.
I have consulted my graduate antenna design textbook, Antenna Theory,
Analysis and Design, Balanis, 1982.
Yagi-Uda designs can be made to satisfy a variety of parameters, including
gain, bandwidth, directionality, and input impedance.

TV Yagis are obviously designed for very wide bandwidth, which implies low
gain.
What I did not remember is that a narrowband FM beam also appears to be a
Yagi, but designed according to an entirely different set of parameters,
where gain is paramount.

So what I should have said is that TV Yagis are wide band, and less than
optimal for FM reception.
The simple Radio Shack 5 element FM beam is probably also a Yagi-Uda, since
I cannot find any reference to a director/reflector design schema other than
Yagi-Uda.