The 4228 is designed to be a UHF antenna. Parts of the feed system resonate at VHF, so some reception of VHF (real channels 7-13) is possible, as you've found. However, the VHF sensitivity is not anywhere close to what the 4228 has at UHF.
You have two options: add a high-VHF antenna Like an AntennaCraft Y5-7-13 or an Antennas Direct C5 and join it to your cable with a UVSJ OR get a proper VHF/UHF antenna like a Winegard HD7696P or AntennaCraft HBU-44. With 30 (WNVT) nearby, you should avoid preamps.
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