[Towertalk] verticals was: F12 C4S

[Pete Smith]

At 10:36 AM 7/8/02 -0400, Guy Olinger, K2AV wrote:
>In urban areas, I've always found quite higher reception of man-made
>noise on verticals, for what ever reason. And unless the vertical is
>over an extended flat copper roof (block of same height row houses),
>practically speaking there's 3 db gone at those touted low angles
>right off the bat, to loss from ground absorption and clutter in most
>situations.


Not to mention the ~6 dB of ground reflection gain, though I grant you it 
is  apt to be at a pretty high takeoff angle unless the dipole is quite 
high.  Still, the lower half of the first lobe can extend pretty far down 
toward the horizon before it is 6 dB below the nose of the lobe.

Another related question  -- I picked up an HF9V vertical to experiment 
with for minimal SO2R use.  I have a 40 x 30 foot nearly-flat galvanized 
steel roof on my garage, and am thinking about placing the antenna in the 
middle of it with the antenna's ground lead connected to the roof.  I 
believe the sections of the roof are fairly well connected together, and 
wonder what sort of performance it is reasonable to expect from it.


73, Pete N4ZR

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