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What it amounts to is a capacitive/'top hat'. It effectively makes a 'short' antenna appear electrically longer. Can it be a benefit? Yes it can in the right circumstances. It can also be detrimental in a number of instances. One thing about it's illustrated use is that any 'cap hat' should be away from any loading coil by a fairly significant distance. Right next to a loading coil a 'cap-hat' reduces the load, makes it less effective.
So, while it isn't total B.S., it can certainly benefit from a little 'salt' (or ExLax) being applied.
- 'Doc
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