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All working fine, it is an optimization question and relates only to static mobile operation.

Thanks, I am using a 3/8 whip connector/ SO-239 fed mirror mount, stainless steel attached to an aluminium rear reversing mirror arm on a high 2M high vehicle. This mirror arm is conductively metal to metal coupled to the rear door (and I bonded the rear door to the rear side panel) I maximized metal to metal conductivity throughout but of course the ideal is through the roof with a large area of steel (middle of a roof) and I want to try and minimize any losses by creating "add ons" if possible.

I feed it with the shortest amount of Super 8 (mini8) cable I can with a 5 turn choke just before feed point. In total about 2.5 meters of cable for negligible cable losses, I shortened it so there is just enough to get it to my transceivers position.

I am additionally thinking that I may be able to G Clamp an aluminium pole at the feed point (as in... right under the vertical antenna) that may help create some form of extra counterpoise.

I am obtaining a very good SWR 1.2:1 and the antenna/s (centre load and a self made tank whip) seem to work pretty well, but you know how it is, improvements are improvements, and if easily obtained, something I am interested in.

Even leaning 2 x 10 foot poles against the mount is feasible and could act as some kind of additional counterpoise.

I suspect the proof in the pudding will be in its eating, which can be fun, but wonder if anyone has done this stuff before. I have seen mirror mounts with what would appear to be a largely pointless 12 inch ground plane stub (image attached) so if I can build on that with any metal structure under the feedpoint to make it "better" than I would like to.

<blockquote data-quote="TheBlaster" data-source="post: 732450" data-attributes="member: 58745">All working fine, it is an optimization question <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f44d.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt="(y)" title="Thumbs Up&nbsp; &nbsp; (y)"&nbsp; data-smilie="27"data-shortname="(y)" /> and relates only to static mobile operation.Thanks, I am using a 3/8 whip connector/ SO-239 fed mirror mount, stainless steel attached to an aluminium rear reversing mirror arm on a high 2M high vehicle. This mirror arm is conductively metal to metal coupled to the rear door (and I bonded the rear door to the rear side panel) I maximized metal to metal conductivity throughout but of course the ideal is through the roof with a large area of steel (middle of a roof) and I want to try and minimize any losses by creating &quot;add ons&quot; if possible.I feed it with the shortest amount of Super 8 (mini8) cable I can with a 5 turn choke just before feed point. In total about 2.5 meters of cable for negligible cable losses, I shortened it so there is just enough to get it to my transceivers position.I am additionally thinking that I may be able to G Clamp an aluminium pole at the feed point (as in... right under the vertical antenna) that may help create some form of extra counterpoise.I am obtaining a very good SWR&nbsp; 1.2:1 and the antenna/s (centre load and a self made tank whip) seem to work pretty well, but you know how it is, improvements are improvements, and if easily obtained, something I am interested in.Even leaning 2 x 10 foot poles against the mount is feasible and could act as some kind of additional counterpoise.I suspect the proof in the pudding will be in its eating, which can be fun, but wonder if anyone has done this stuff before. I have seen mirror mounts with what would appear to be a largely pointless 12 inch ground plane stub (image attached) so if I can build on that with any metal structure under the feedpoint to make it &quot;better&quot; than I would like to.</blockquote>

[QUOTE="TheBlaster, post: 732450, member: 58745"] All working fine, it is an optimization question (y) and relates only to static mobile operation. Thanks, I am using a 3/8 whip connector/ SO-239 fed mirror mount, stainless steel attached to an aluminium rear reversing mirror arm on a high 2M high vehicle. This mirror arm is conductively metal to metal coupled to the rear door (and I bonded the rear door to the rear side panel) I maximized metal to metal conductivity throughout but of course the ideal is through the roof with a large area of steel (middle of a roof) and I want to try and minimize any losses by creating "add ons" if possible. I feed it with the shortest amount of Super 8 (mini8) cable I can with a 5 turn choke just before feed point. In total about 2.5 meters of cable for negligible cable losses, I shortened it so there is just enough to get it to my transceivers position. I am additionally thinking that I may be able to G Clamp an aluminium pole at the feed point (as in... right under the vertical antenna) that may help create some form of extra counterpoise. I am obtaining a very good SWR 1.2:1 and the antenna/s (centre load and a self made tank whip) seem to work pretty well, but you know how it is, improvements are improvements, and if easily obtained, something I am interested in. Even leaning 2 x 10 foot poles against the mount is feasible and could act as some kind of additional counterpoise. I suspect the proof in the pudding will be in its eating, which can be fun, but wonder if anyone has done this stuff before. I have seen mirror mounts with what would appear to be a largely pointless 12 inch ground plane stub (image attached) so if I can build on that with any metal structure under the feedpoint to make it "better" than I would like to. [/QUOTE]

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