[TowerTalk] Shadowing of small antennas by larger ones?

Pete Smith n4zr@contesting.com
Mon, 29 Jan 2001 09:30:55 -0500

Mechanical and wind-load considerations aside, is there a significant
gain/pattern problem with placing a significantly larger antenna above a
smaller one on the same tower?  For example, consider a Force 12 C-19XR
tribander, with a Force 12 340N 40-meter antenna (elements roughly 85
percent of full size) mounted 12 feet above.  Force 12 states that
interaction is no problem because of the design of the N elements.  If that
is given, then I wonder if there are other considerations.  Would the big
antenna, by its presence, interfere with pattern formation or gain, by what
some people call "shadowing."  Or is that just another urban myth?

73, Pete N4ZR
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