I agree with Joe that the Winegard HD7694P is a good choice and that you can't use a preamp because it will be overloaded by WPXC.
Interpreting Noise Margin in the TV Fool Report
http://www.aa6g.org/DTV/Reception/tvfool_nm.html
Try it first with just one TV, then add a splitter for the other TVs.
If WPXC is so strong that it is harming the reception of your weaker channels, you can try inserting a Channel Plus NF-471 Notch Filter to make WPXC weaker without doing too much harm to your other channels.
NF-471: Notch Filter
Removes CATV channels 75-80 and UHF channels 24-29
Notch filter frequency 529.25 MHz to 559.25 MHz
24 530-536 MHz
25 536-542
26 542-548
27 548-554
28 554-560
29 560-566
Par Electronics might make a filter to attenuate channel 24:
http://www.parelectronics.com/single-channel-tv.php
Tin Lee Electronics in Canada could also make one for you, but it would be expensive.