Assuming you have asphalt shingles on the south side of your roof, you could try a DB8e or CM4228 in your attic aimed at 174 magnetic. Try it without a splitter and preamp first. If you're having trouble picking WGRZ up, you can try adding a preamp. I pick up a station (15 db noise margin) with a 10db gain antenna in my attic, but I needed to add an RCA PRAMP1R to stabilise the signal.
If it still doesn't work with a preamp, put it on the roof in the spring.
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