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When I remove the cat (top) hat in my models and adjusted the upper vertical element to compensate, the antenna performed about the same, but didn't tune as well. The R variable was in the low 70's instead of near 50 ohms.

Plus, according to the patent the top of the antenna was meant to meet certain height requirements (the patent speaks of government limit of 20 feet above the building the antenna is mounted on), so when mounting for said specific maximum height allowed, the cap hat allows the rest of the antenna to be mounted higher, which increases performance some (I doubt so much that you would notice). Mounting this antenna this way, the patent also talks about the antenna being more likely to be above other nearby obstructions, such as other houses, effectively putting this antenna's signal in the free and clear.

The DB

<blockquote data-quote="The DB" data-source="post: 591097" data-attributes="member: 21346">When I remove the cat (top) hat in my models and adjusted the upper vertical element to compensate, the antenna performed about the same, but didn&#039;t tune as well.&nbsp; The R variable was in the low 70&#039;s instead of near 50 ohms.Plus, according to the patent the top of the antenna was meant to meet certain height requirements (the patent speaks of government limit of 20 feet above the building the antenna is mounted on), so when mounting for said specific maximum height allowed, the cap hat allows the rest of the antenna to be mounted higher, which increases performance some (I doubt so much that you would notice).&nbsp; Mounting this antenna this way, the patent also talks about the antenna being more likely to be above other nearby obstructions, such as other houses, effectively putting this antenna&#039;s signal in the free and clear.<a href="http://hittman.us" target="_blank">The DB</a></blockquote>

[QUOTE="The DB, post: 591097, member: 21346"] When I remove the cat (top) hat in my models and adjusted the upper vertical element to compensate, the antenna performed about the same, but didn't tune as well. The R variable was in the low 70's instead of near 50 ohms. Plus, according to the patent the top of the antenna was meant to meet certain height requirements (the patent speaks of government limit of 20 feet above the building the antenna is mounted on), so when mounting for said specific maximum height allowed, the cap hat allows the rest of the antenna to be mounted higher, which increases performance some (I doubt so much that you would notice). Mounting this antenna this way, the patent also talks about the antenna being more likely to be above other nearby obstructions, such as other houses, effectively putting this antenna's signal in the free and clear. [URL='http://hittman.us'][COLOR=#000000]The DB[/COLOR][/URL] [/QUOTE]

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