For an attic antenna, I would suggest getting a sheet of corflute and making your antenna with copper/aluminium tape.
It is both cheap, and very fast and easy to make and adjust. The 70cm sleeve choke, which is sensitive to both spacing and length, is especially easy to adjust.
You can make any type of antenna directional or not, here’s a 2m/70cm moxon
Foil antennas can easily have very wide elements for better bandwidth if you want.
This is far and away the best, cheapest way to make VHF/UHF antennas, except for that pesky wind thing.