You may need a rotor to point the antenna to the precise direction the each distant signal emanates. Also, if possible, use a low loss twin lead as opposed to coaxial cable. Coax may have a longer life than twin lead but it has higher signal loss than a quality twin lead.

I am not familiar with the neighborhood you are in but my guess is that you are surrounded by high rise structures to the south where these signals are coming from. If that is the case, and the rotor does not improve the quality of your reception, you may have to try putting up a taller tower to get a better signal.