Do you feel that a higher end tuner will perform adequately with lesser antenna? I ask because I'm wondering if shifting the cost (and possible hassle) from a roof mount antenna to a better tuner with a lesser antenna would be a reasonable consideration.
My best sounding tuner is the Magnum Dynalab 108T. I also think it has the weakest reception, so I use my MD ST-2 antenna outside my office on the roofline (not on roof). I have great tuning now. Some people hang this antenna upside down in their attic.
My best reception is with my Sony XDR-F1HD which can be bought used on eBay for under $200. I use a simple $10 diploe antenna inside my office for that one. It sounds very good but not at the level of the 12X more expensive MD 108T.