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Propagation characteristics of horizontally polarized RF

Propagation characteristics of horizontally polarized RF

Propagation characteristics of horizontally polarized RF

(OP)
My cow antenna my be easiest to configure if it radiates with horizontal polarization.  I am interested in the 433 Mhz band as well as 900 Mhz meaning that blocking vertical polarized interference is a Plus.

My Questions:
Compared with vertical,
1) How well does horizontal propagate over distance of 1 mile from a 4' TX to a 32' RX?  
2) What is the comparative attenuation through foliage? (sparse 50/50% evergreen trees as in a free range area)
3) How well does it diffract around/over/under trees and buildings?

What is my best reference for this?

Thanks very much!
Jim

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