I asked Samsung about a bad tuner. They said they could send someone to check it and if it is bad it would be covered under warranty but if there is no problem they would charge us to have it checked.
Here are the links for a higher antenna.
http://www.tvfool.com/?option=com_wr...2df9d5f8696dfa
http://www.tvfool.com/?option=com_wr...2df96ca711b006
http://www.tvfool.com/?option=com_wr...2df99ede797053