Famicom picture quality

[JJ_Lincoln]

Hi, I've been trying to find a way to improve the picture quality of my Famicom on both my 1996 GE CRT and 1989 RCA CRT. The '96 GE has a bit better quality, and both only have Co-Ax ports in the back. I don't want to buy a Sony Trinitron if I don't have to. Auto program only gets so good, is there another way to improve the quality? Thanks,
Jerry

[FAMICOM_87]

the coaxial cable is the way 
http://www.famicomworld.com/forum/index.php?topic=12321.0