I don't think how high I am has anything to do with it but being higher does help alot. Sadly I'm not.
I think the reason why line of sight is blocked over here is because our place is crammed in between 2 other 4 floor houses, and then there's 2 hills to the northwest of me.
The signals have to pass through walls and houses, and it doesn't go through.
If I do end up mounting an antenna, I'll have to ground it because we get some bad storms in the summer season.