John, while it is true that bow-tie arrays can have positive gain on high-VHF channels, that gain is typically no more than 3 dBi, is limited to only a few channels in the band, and VSWR is a big problem.
An attic install with a 1-edge path, despite the high NM, requires a properly designed high-VHF antenna. Some modelling data to back this up is
here and corresponding test data is
here.