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Marconi, I have used two different masts for a lot of testing/comps.
I thought about mentioning results I've had on them with respect to the RF issues, but thought my problems were not really related to CMC on the mast nor the coax, but was a proximity issue. I did not want to muddle the pool of thought.

The tip-over mast as an upper metal mast that does not touch the earth, so unless I provide that contact otherwise it is essentially ungrounded. I do not experience any issues with antennas on this mast. The other mast at the end of the house does descend to the earth. No matter which antenna I put on it I see some RF activity, even when I use a choke and well shielded coax. I have been able to reduce the proximity effects within the house/shack by raising the antennas higher up at that location, using a very well constructed choke, and the best coax I own, but that was not conclusive enough to provide proof it was CMC. When I moved the same antennas to the other mast farther away I gained the best results telling me my issue was RF going directly into the TV and PC speakers.
One might think it was some multiple of coax length that had the differing effects, but no. Either of those antenna masts were outfitted with similar length coax, about 80' long.

The antennas in the attic can completely freeze up my PC in the shack/garage when I use them requiring a restart to get it back online. Proximity.

<blockquote data-quote="HomerBB" data-source="post: 420501" data-attributes="member: 8569">Marconi, I have used two different masts for a lot of testing/comps.I thought about mentioning results I&#039;ve had on them with respect to the RF issues, but thought my problems were not really related to CMC on the mast nor the coax, but was a proximity issue. I did not want to muddle the pool of thought.The tip-over mast as an upper metal mast that does not touch the earth, so unless I provide that contact otherwise it is essentially ungrounded. I do not experience any issues with antennas on this mast. The other mast at the end of the house does descend to the earth. No matter which antenna I put on it I see some RF activity, even when I use a choke and well shielded coax. I have been able to reduce the proximity effects within the house/shack by raising the antennas higher up at that location, using a very well constructed choke, and the best coax I own, but that was not conclusive enough to provide proof it was CMC. When I moved the same antennas to the other mast farther away I gained the best results telling me my issue was RF going directly into the TV and PC speakers. One might think it was some multiple of coax length that had the differing effects, but no. Either of those antenna masts were outfitted with similar length coax, about 80&#039; long. The antennas in the attic can completely freeze up my PC in the shack/garage when I use them requiring a restart to get it back online. Proximity.</blockquote>

[QUOTE="HomerBB, post: 420501, member: 8569"] Marconi, I have used two different masts for a lot of testing/comps. I thought about mentioning results I've had on them with respect to the RF issues, but thought my problems were not really related to CMC on the mast nor the coax, but was a proximity issue. I did not want to muddle the pool of thought. The tip-over mast as an upper metal mast that does not touch the earth, so unless I provide that contact otherwise it is essentially ungrounded. I do not experience any issues with antennas on this mast. The other mast at the end of the house does descend to the earth. No matter which antenna I put on it I see some RF activity, even when I use a choke and well shielded coax. I have been able to reduce the proximity effects within the house/shack by raising the antennas higher up at that location, using a very well constructed choke, and the best coax I own, but that was not conclusive enough to provide proof it was CMC. When I moved the same antennas to the other mast farther away I gained the best results telling me my issue was RF going directly into the TV and PC speakers. One might think it was some multiple of coax length that had the differing effects, but no. Either of those antenna masts were outfitted with similar length coax, about 80' long. The antennas in the attic can completely freeze up my PC in the shack/garage when I use them requiring a restart to get it back online. Proximity. [/QUOTE]

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