its def. hit or miss…some just work better for certian situations. just save your reciept if you get ohme & its not that good, take it back & try another model/brand/style
& location you put it in the house is key too, my TV is in my living room , but when i was using the indoor one it was in an upstairs spare bedroom.
as far as your boy getting 20+…ive heard of people who live like in cranberry & other outer lying town being able to pick up Pittsburgh & other towns feeds, like erie, youngstown etc.