The problem with the winegaurd whether snow flake or other type is the wiring I have found, I have fixed a couple so far that have defied the "Service Technicians" and it's been down to crappy wiring connections. I could build a high gain aerial but it would be about 2.5 metres long, great picture though.
The quality of the TV plays a big part in tuning in stations also, the earlier Tv's tuners just aren't as good as the new stuff, my new TV pulls in signals where the old one had trouble.
The digital signal is transmitted on VHF and UHF frequencies but it is the Vertical or Horizontal polarization that knocks some of the aerials out of action, my flat bar Winegard get's a pin taken out when I need vertical, usually a waste of time as the shows are crap anyway.
Carry a compass in the van and use the My Switch app to find whether vertical or Horizontal and where to point the damn thing, will have to get a sat dish one day, more stuff to pack !!!!!!