Would there be too much loss in RG-58 coax for the base? Only a 30-50'
run.

I don't think the mobile installation matters all that much, but I
could be wrong. I might try to find some Mini 8 for the mobile, RG 8
will prolly be too bundlesome. If not, I will try some RG-58 with it
as well.

Will this be going in the wrong direction entirely (too much loss)?