The new information is not a great change. I doubt you would have much success with an attic install.
If we were neighbors, you'd likely see a 5' tripod and 10' mast on my roof. 3starinc.com is one of many sources.
If programming from
WPCP is of interest to you, you would also need a rotator.
NTE offers a rotator and thrust bearing that can handle large antennas. The down-side to a rotator and multiple sets is that not everyone will be pleased with the direction the antenna is aimed.