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The responses here are deeply technical so I will make no commentary, I can only go so far with my existing knowledge.

What I can add operationally is that I saw no difference in SWR reading on my IMAX2000 (no groundplanes anbd no choeks of any kind direct coaxial attachment) - VSWR 1.4:1 at 15 feet high and a then at 30 feet high identical. I managed to get my IMAX to 30 feet with great results. 150 mile long contacts to another hill top station in UK and a DX into Angola (my first to Angola Africa) I also spoke to someone in Holland which is exceptionally rare from the UK (I spoke to Australia more times than in Holland) as it sits approx 250 miles away which means for F2 layer DX it is in a "dead zone" because typically there can be no F2 layer reflections. So I believe this was a tropospheric enhancement/ducting.

The SWR did not change with exactly the same coax used and same equipment set up. So earth did not effect the feed impedance in my case.

<blockquote data-quote="RadioDaze2.0" data-source="post: 549333" data-attributes="member: 45866">The responses here are deeply technical so I will make no commentary, I can only go so far with my existing knowledge.What I can add operationally is that I saw no difference in SWR reading on my IMAX2000 (no groundplanes anbd no choeks of any kind direct coaxial attachment) - VSWR 1.4:1 at 15 feet high and a then at 30 feet high identical. I managed to get my IMAX to 30 feet with great results. 150 mile long contacts to another hill top station in UK and a DX into Angola (my first to Angola Africa) I also spoke to someone in Holland which is exceptionally rare from the UK (I spoke to Australia more times than in Holland) as it sits approx 250 miles away which means for F2 layer DX it is in a &quot;dead zone&quot; because typically there can be no F2 layer reflections. So I believe this was a tropospheric enhancement/ducting.The SWR did not change with exactly the same coax used and same equipment set up. So earth did not effect the feed impedance in my case.</blockquote>

[QUOTE="RadioDaze2.0, post: 549333, member: 45866"] The responses here are deeply technical so I will make no commentary, I can only go so far with my existing knowledge. What I can add operationally is that I saw no difference in SWR reading on my IMAX2000 (no groundplanes anbd no choeks of any kind direct coaxial attachment) - [B]VSWR 1.4:1[/B] at 15 feet high and a then at 30 feet high identical. I managed to get my IMAX to 30 feet with great results. 150 mile long contacts to another hill top station in UK and a DX into Angola (my first to Angola Africa) I also spoke to someone in Holland which is exceptionally rare from the UK (I spoke to Australia more times than in Holland) as it sits approx 250 miles away which means for F2 layer DX it is in a "dead zone" because typically there can be no F2 layer reflections. So I believe this was a tropospheric enhancement/ducting. The SWR did not change with exactly the same coax used and same equipment set up. So earth did not effect the feed impedance in my case. [/QUOTE]

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