No, the yagi is just for VHF-Hi band. You would use a VHF/UHF Diplexer to combine the two antennas, commonly called a UVSJ (UHF/VHF Splitter-Joiner) in the OTA antenna world. Google them for a source. Just a couple bucks a piece.
Some preamps, like the one I have here, in my signature allow you to hook up antennas from separate frequency bands, eliminating the need for a UVSJ.
This will give you much more gain in VHF Hi, than the simple dipole that you have now.
I assume the dipole can be removed from your existing antenna.
This is a decent yagi, and only costs like $30 plus shipping.
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