Topband: [Topband] 160M/80M Vertical - using a capacity hat below a trap

[rich kennedy via Topband]

Thanks to the following who responded to the below question:
George, W8UVZCarl, KM1HTom, W8JIRoger, N1RJ
73, Rich, K3VAT

-----Original Message----- 
From: rich kennedy via Topband
Sent: Wednesday, October 01, 2014 8:15 AM
To: topband at contesting.com
Subject: Topband: 160M/80M Vertical - Using a capacity hat below a trap

Im finalizing design for my 160M/80M shortened wire tree-mounted vertical.  An Unadilla 80M trap will be placed approx. 65? feet above the feedpoint; above the trap is another 20 feet with a small cap hat.  An autotuner handles the Z matching for the anticipated 500 watts on both bands.

QUESTION: Can one install a capacitive hat directly below the 80M trap to help shorten the length of the 80M section?  For example, shortening the 80M radiator to 60? (from 65?) and making up ?the difference? with a capacity hat?  Any 
downside?

NOTE: Please omit suggestions about using a larger hat on 160M (sloping wires, etc.) ? I know that it is much more desirable, but that is just not feasible here at K3VAT.

Thanks, 73, Rich, K3VAT
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