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echo: tech
to: Leonard Erickson
from: MIKE ROSS
date: 2003-07-06 09:34:32
subject: RECEPTION, TV

"Leonard Erickson" wrote to "Phil Marlowe" (06 Jul 03  01:24:06)
 --- on the topic of "RECEPTION, TV"

 LE> Don't forget that "flat" land *curves*. That antenna may be low the
 LE> horizon where you are. I don't have the formulas handy to figure out
 LE> how high you need to be to see something over the bulge of the Earth's
 LE> surface at a given distance.

I just read a chart for VHF propagation. There's a dotted line labeled
"Line of sight" at about 70-80 miles. It shows reception of VHF at over
a 200 mile limit however I suspect that would be mostly for FM radio.
High UHF is mostly limited to "line of sight" unless there is ducting.
As for the flat land, the "line of sight" distance increases a lot if
the antenna site is elevated such as when erected on a mountain top.

 Mike
 ****

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