Marantz SR-630, Speaker Hookup

Thank you for helping. The entire system is composed of the AM/FM amp, TAPE DECK and CD deck. I have not connected anything but the AMP and the speakers and the antenna. I used the little wire T shaped antenna (looks like the old TV antenna wire). The two speakers I have are on the other side of the room, wiring running behind the bottom moulding on the floor, one double wire to each of the two speakers. The arrangement at the back of the AMP is as follows; br BR
BR rb
Two speaker wires from one speaker run from the connection in CAPS on the top row and the other two speaker wires run from the connection in CAPS on the bottom row.
I get the loud "driving" sounds in AM. a little less distortion from FM, both unacceptable.
I'm 80 years old and like to listen to AM radio and this problem is frustrating me to no end.
Any advice other than junking the whole mess?

YOU GOT IT!!!!
I disconnected the flat antenna and put a short piece of brazing rod on one of the two screw down attachments marked (AM Antenna) and the "driving" seemed to stop on most of the AM scale. I say most, in that it still drives in the lower range, i.e. 740, but does not drive in the 950 and up range. Do you think one of the commercial (powered) antennas would help the problem? The 740 setting (a local station) has some of my favorite programming.
You don't know how much I appreciate your help, it has improved my disposition a great deal. I should mention that the FM antenna connection is in the form of a screw type coax (female) connector.
Once again, please accept my gratitude for your patience. DR