Do you mean having it facing an outside wall?I have several of my antennas inside and they pass thru the wall,even WWCP fox8! These are fantastic antennas.
I would go with the 4228, that way you would get a reliable signal. It's only about 20.00 more. The 4220 will get you 2,8,11,13,16,22,40,53,and analog 19 good.Be sure to use RG6 cable. Warren Electronics will get you the best deal! Have fun!