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Bob, here is my model of the NV4K at 8.5' above the Earth, showing a good match. When I raise this model to 36' feet the match hardly changes, but the gain does change dramatically.

I recall that my S4 antenna match was always very stable on raising, and I probably was suprised at that too at some point considering ohter antennas like the 5/8 wave vertical match always seemed to need a bit retuning on raising.

Just my modeling experience compared below for the NV4K. BTW, these models have no choke to mitigate CMC's, and there is no sign of currents on the mast as noted. The models are Isolated however, but if I added a feed line then maybe that would tell us if the model needs CMC mitigation.

<blockquote data-quote="Marconi" data-source="post: 747684" data-attributes="member: 903">Bob, here is my model of the NV4K at 8.5&#039; above the Earth, showing a good match. When I raise this model to 36&#039; feet the match hardly changes, but the gain does change dramatically.I recall that my S4 antenna match was always very stable on raising, and I probably was suprised at that too at some point considering ohter antennas like the 5/8 wave vertical match always seemed to need a bit retuning on raising. Just my modeling experience compared below for the NV4K. BTW, these models have no choke to mitigate CMC&#039;s, and there is no sign of currents on the mast as noted. The models are Isolated however, but if I added a feed line then maybe that would tell us if the model needs CMC mitigation.<img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f914.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":unsure:" title="Unsure&nbsp; &nbsp; :unsure:"&nbsp; data-smilie="28"data-shortname=":unsure:" /><img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f914.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":unsure:" title="Unsure&nbsp; &nbsp; :unsure:"&nbsp; data-smilie="28"data-shortname=":unsure:" /><img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f914.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":unsure:" title="Unsure&nbsp; &nbsp; :unsure:"&nbsp; data-smilie="28"data-shortname=":unsure:" /></blockquote>

[QUOTE="Marconi, post: 747684, member: 903"] [SIZE=5] Bob, here is my model of the NV4K at 8.5' above the Earth, showing a good match. When I raise this model to 36' feet the match hardly changes, but the gain does change dramatically. I recall that my S4 antenna match was always very stable on raising, and I probably was suprised at that too at some point considering ohter antennas like the 5/8 wave vertical match always seemed to need a bit retuning on raising. Just my modeling experience compared below for the NV4K. BTW, these models have no choke to mitigate CMC's, and there is no sign of currents on the mast as noted. The models are Isolated however, but if I added a feed line then maybe that would tell us if the model needs CMC mitigation.:unsure::unsure::unsure:[/SIZE] [/QUOTE]

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