Got it timgr! Thanks for the explanation.
I'm crossing my fingers that we get the important channels in the attic (ABC, NBC, CBS, PBS, FOX)...my kids only watch PBS cartoons in the daytime and my husband will watch whatever football is on. That's about it. It's why we cut the cord to begin with - rarely watched TV and we stream videos/movies online for us and the kids. We save the money from not having cable tv and throw it at our internet cable bill, LOL.
Thanks again everyone for all your input!
I think I'm settled - I'm going to Walmart and getting a half way decent antenna to try in the attic and if it's a no-go, then we'll just have to bite the bullet and mount it outdoors