The loop (rectangle to be more precise) element of the RCA antenna is going to perform as well or better than the Leaf. The dipole elements will provide VHF capability that the Leaf simply doesn't have. A Terk HDTVi (not HDTVa) is another good indoor design to consider,
http://forum.tvfool.com/showthread.php?t=2828.
Do you have any way to mount an RCA ANT-751 on a rail or wall? It sounds like you simply have no way to get a view to the NW...