I suggest move the antenna to the outside above the roof. Outdoor Tv antennas receive the best when the Tv antenna has elbow room. Outdoor Tv antennas receive the best when the Tv antenna is not being crowded. Outdoor Tv antennas receive the best when the Tv antenna has nothing blocking the reception. Outdoor Tv antennas receive the best when the Tv antenna has a clear view of the transmitting antennas. All the easy to receive channels are LOS = Line Of Sight. The Tv antenna will be very happy when the Tv antenna can see the transmitting antennas. Federal Law is that Yes you can install and use a Tv antenna outside , and Yes the antenna can be installed and used in a place that gives the best reception ,
http://www.fcc.gov/mb/facts/otard.html