I don't believe you will have an electrolysis
problem. You can block any DC by cutting the copper strap and jumping across it will some small capacitors. These will be transparent to rf, but not allow dc current
. See about 3/4 down the page here: Grounding
. Our Manta's arch has been connected this way for 10 years without electrolysis issues.
The ground plane for rf is defined by surface area, so those tubes have a lot of surface area to offer. I forgot that Manta
switched to a fiberglass
top instead of aluminum
, so you won't get any help from that. We have a fabric
top, so we also don't get rf ground help from it.
I don't know the answer to your question about rf interference
on your engine pc through the copper foil. Maybe someone else will help there.
Your current antenna
will not stand without support. You would need to change to a different model if you wanted to move it to the top of the arch.