The U75-R was barely performing for you on the VHF channel.

I would probably upgrade to an antenna that was strong enough to surely receive both UHF and VHF both day and night.

I would probably go with at least a Winegard HD7694P, maybe a 7695.

I might go for the 7695, its only $4 more than the 7694 and the gain and F/B ratio is slightly better, but they are about twice the price of the U75-R and CM antenna.

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Hitachi 57F59; Sony VHP-D50Q - 7' diag on wall
DishNetwork ViP722k; DishNetwork ViP211; DishNetwork ViP211K; DishNetwork 301; 2 - TiVo Series 2's; Accurian 6000; Samsung SIR-T351; Panasonic Showstopper 2000; ATI HDTV Wonder
Hauppauge HD PVR; Sony PS3; Toshiba HD-A3 HDDVD
Dish 1000 on 110,119&129; Dish 500 on 61.5
RS U75-R; Funke PSP.1922