The following is a Teleview recommendation for broadcast Tv reception.
Any size of broadcast Tv antenna , big or small , can be , installed , used , maintained , above the roof or any where else on your property.
Here is the Federal Antenna Law that says yes you can , install use , maintain , broadcast antennas of any size , Yes Big antennas are protected by Federal Law.
http://www.fcc.gov/mb/facts/otard.html.