I would give your Clearstream 4V a try on the roof before trying a different antenna such as the 7694P. The two VHF-hi stations you care about (WJZ-13 and WBAL-12) look to be very strong and a bit more elevation and some luck could yield reliable reception, even with the 4V's simple dipole. As JoeAZ said, you may have to hunt around on the roof to find that sweet spot.
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