Continue to use the radials on top of the roof... Install the mesh
under the roof (attic I assume) and lap it over the rafters and just
twist the free ends to each other so that the mesh is relatively one
piece... Don't bother with solder.. Don't waste your time connecting
the radials to the mesh... The radials will couple with the mesh
electromagnetically...

If you are planning on putting the mesh out on the roof ( I would not
because it will rust and disintegrate in just a few years.) It has to
go underneath the radials, not over them... Again, do not mechanically
connect the radials to the steel... Just the proximity will couple
them... Think twice about putting the mesh outside... You will have a
nasty mess very soon...

denny / k8do