Note: The earliest versions of the Commodore 64 (having a 5-pin DIN video output) had an inferior quality video circuit and video chip. This cable will give a better picture with these old units by using the video input of your television than will result from using the RF output from the computer (which goes to the antenna or cable input of a television) but usually won't result in as nice of picture as you will get if you use this same cable on a Commodore 64 which has the later style 8-pin video output-- mainly due to the fact that most of the Commodore 64 computers with the 8-pin video output had later (nicer) version video chips. Both versions of the Commodore 64 will get the nicest picture with this cable if used with a monitor which supports chroma and luma (seperated) video inputs such as most Commodore monitors from that era have.
Jim Butterfield (one of the greatest Commodore experts) wrote an excellent article called "How to Improve the TV Quality of the Commodore 64" which explains in great detail many of the dynamics involved in getting a nice picture from your Commodore 64 and 128. If you read and understand his article you will know why this cable is such a great choice. This article appeared in Compute! magazine issue 42 on November 1983 on page 191. You may want to use one of the internet search engines to locate this article (which can be found online still as of May 2015) and read more details about this matter.