Can appreciate difficulty of schlepping this monster around (borrow truck + dolly?)
The symptoms of vert height - hard to reconcile with tuner or RF at all, though 'regular snow' from absent signal is that ol Big Bang residue. Sure your snow is like that?
Anyway - usually only one thing goes, but that one thing may be a PS common to tuner and vertical. Vertical output (power) xsistor might even be the only culprit.
Get diagnostic estimate from someone known to have repaired (something!) well (?) Seems a waste to trash it when maybe under $100 could get the dust blown out and convergence zeroed in..
Luck..
Ashton