Just hook in to the regular antenna. It'll work fine. HDTV antennas are a joke.
But if you really want to install an antenna, as long as you do it in an exclusive use area they have to let you do it.
What that means is you can install an antenna in any area that's for your exclusive use. If you have a private balcony, you can put an antenna on it and your landlord's not allowed to stop you.
http://www.fcc.gov/mb/facts/otard.html
That'll give you the crash course on what you can and can't do.