[TowerTalk] Holy SteppIR!

Joe Subich W4TV at subich.com
Tue Dec 27 10:26:24 EST 2005


Mike,

> The antenna array in question (6 yagi H-frame), has enough
> gain and is mounted high enough that it is probably starting to
> look more like a high-gain VHF/UHF array than a traditional
> stack of HF yagis.

The lobe/null structure of this array is such that the elevation
would need to be well above 20 degrees before the ground reflection
disappeared.

The arrival angle statistics in the ARRL Antenna Book (HFTA) show
there is very little use for arrival angles above 25 to 30 degrees
except for some short distances (domestic and W4 -> South America).

73,

    ... Joe, W4TV





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