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There seems to be a lot of mystery about this antenna. So, speculation , or guessing things about it, happens. As with all antennas people give attributes to them that are not necessarily true. Because the antenna uses the mast as a part of the antenna some assume it needs to be isolated at a certain point blow the ring, or if someone has experienced common mode currents resulting in TVI they may believe it is due to not having the mast isolated because of what someone wrote in the internet. The story gets bigger and bigger with time.
DB has been modeling some of those ideas in this thread about mast lengths and such, and he may remember more correctly, but nothing has proven the need for isolating the mast from earth. Only that the mast contributes to the overall function of the antenna.
I have had the AP, both a homebrew and a factory model, up several times on masts of different lengths. Once I had it up 10' above a 4 element Yagi. In none of those installations from ~6m to ~12m to the ring did I ever experience any odd behaviors from the antenna to indicate the need for isolation along the mast anywhere.
Install yours and enjoy it.

<blockquote data-quote="HomerBB" data-source="post: 593181" data-attributes="member: 8569">There seems to be a lot of mystery about this antenna. So, speculation , or guessing things about it, happens. As with all antennas people give attributes to them that are not necessarily true. Because the antenna uses the mast as a part of the antenna&nbsp; some assume it needs to be isolated at a certain point blow the ring, or if someone has experienced common mode currents resulting in TVI they may believe it is due to not having the mast isolated because of what someone wrote in the internet. The story gets bigger and bigger with time.DB has been modeling some of those ideas in this thread about mast lengths and such, and he may remember more correctly, but nothing has proven the need for isolating the mast from earth. Only that the mast contributes to the overall function of the antenna.I have had the AP,&nbsp; both a homebrew and a factory model, up several times on masts of different lengths. Once I had it up 10&#039; above a 4 element Yagi. In none of those installations from ~6m to ~12m to the ring did I ever experience any odd behaviors from the antenna to indicate the need for isolation along the mast anywhere.Install yours and enjoy it.</blockquote>

[QUOTE="HomerBB, post: 593181, member: 8569"] There seems to be a lot of mystery about this antenna. So, speculation , or guessing things about it, happens. As with all antennas people give attributes to them that are not necessarily true. Because the antenna uses the mast as a part of the antenna some assume it needs to be isolated at a certain point blow the ring, or if someone has experienced common mode currents resulting in TVI they may believe it is due to not having the mast isolated because of what someone wrote in the internet. The story gets bigger and bigger with time. DB has been modeling some of those ideas in this thread about mast lengths and such, and he may remember more correctly, but nothing has proven the need for isolating the mast from earth. Only that the mast contributes to the overall function of the antenna. I have had the AP, both a homebrew and a factory model, up several times on masts of different lengths. Once I had it up 10' above a 4 element Yagi. In none of those installations from ~6m to ~12m to the ring did I ever experience any odd behaviors from the antenna to indicate the need for isolation along the mast anywhere. Install yours and enjoy it. [/QUOTE]

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