You'll need a balun like this -
http://www.amazon.com/WINEGARD-TV-29.../ref=pd_cp_e_1
A 5' mast in that eave bracket won't leave enough distance between the two antennas. A 10.5' chain link fence top rail makes a good mast. Inexpensive (ca $12) at the local home center. Keep the antennas separated by 3-4' on the mast, so they won't be electrically coupled.