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You should be aware: effectiveness of an attic installation is difficult to predict. There are too many unknowns, in the material of the roof and structure, trees and buildings and other obstructions on the other side of the roof, and conductive and/or noisy wires, pipes, chimneys, etc. that are part of the building. Antennas are designed to function in free air, and you can change their electrical characteristics by placing them in other environments. Some building materials are more transparent to signals than others. Stucco, for example, contains wire mesh typically and is basically opaque to TV signals.
The DB8e is a very sensitive antenna for UHF. It's not deaf to VHF, but you are 1) installing it in an attic and 2) the stations you want are not extraordinarily powerful at your location. They are strong, but not overwhelmingly strong. And 3) they are spread out. Which directions had you planned to point the panels? When you splay the panels, it reduces the sensitivity of the antenna.
You can always add a VHF antenna in addition to the DB8e. Lots of people install the DB8e along with the Antennacraft Y5713 or Y10713. These are not expensive, but realize that the boom length is 5' and 10' respectively, so you'll need some room in your attic. Half power beam width of these yagis is about 50 degrees, roughly the separation of the stations. So I think you have a good chance to get both of them with a yagi, if the attic surroundings cooperate.
Your alternative is to go with a VHF-UHF combination antenna like the Antennacraft HBU44 or HBU55.
If you went on the roof, you'd get a bunch of stations.
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