Attic antenna - HOA
Outside works best, like Jim says.
Actually, you can put up the antenna outside and the HOA can't do anything to stop you. Look up OTARD - Over-the Air Reception Device rule.
You can put up a satellite dish too if you want.
Check out tvfool and enter your specific address. It will give you a good idea as to what you'll need.
From checking your zip code you may be able to get away with a set top antenna on each. You probably won't have trouble with really any antenna. Yes you can split it, outside is fine if...