I just bought that same antenna a month ago. I can get the weak transmitter 55 miles away that has 4 stations with old shows/movies from the 50s-80s, MeTV etc but I can’t get the stronger transmitters 75 miles away in the exact same direction which has the main networks abc/cbs/nbc/fox.
pisses me off. 150 miles my arse. I’m going to try to get it higher in the air and see if that helps but I think I just need a big yagi antenna. Same design but 4-5 times the size.
I am sure that you realize that there are a number of factors that responsible for your reception difficulties. These are combinations of distance, terrain, and electromagnetic interference. And unfortunately the FCC licenses stations for the most part to have a 60 mile range. If they have a superior location for their broadcasting tower then in general the power that they are licensed to use is reduced. HDTV stations broadcast in the UHF spectrum. The power required to get the same range is much higher than what VHF TV stations used to broadcast at and this is calculated more precisely so unfortunately the signal peters out more abruptly in fringe areas.
You are probably going to have to do some research to figure out what is working for other people with similar reception issues and even then something that works for your neighbor 2 miles away might not work for you. So I would advise strongly to not purchase anything that cannot be returned fairly easily.