Is the head of your antenna white? If so, it SHOULD be digital ready, IIRC. Try getting the splitters out of the circuit. I found that the splitter to supply the basement antenna jack was causing me to not receive channels that I did get in the bedroom (no splitter). You also ought to check and make sure that the 12 volt DC is getting to the antenna head when the amplifier switch is on. Take a voltmeter up on the roof with you and disconnect the cable from the antenna head. You should read 12 volts (+/-) across the cable inner lead and connector body. Also, antenna aiming seems to be somewhat more critical with the digital signals.
Finally, I'm assuming your new TV has a digital tuner or one of the digital-to-analog converters and that you have tried rescanning the channels, which you will need to do every time you move to a new broadcast area.
Hope the fix is simple and cheap for you.
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