I mean , it's working but the picture that come through RF was so terrible , filling with statics / white noises. Do I need RF Switch for famicom or what? Right not I just connect the console through normal RF cable without any switch box.
I haven't used RF Famicom since I moved to SFC 20 years ago , all other famicoms I bough recently were pre-modded so I don't really remember how to deal with this RF business. I don't have NES RF box to try it out either.
I'd try with an RCA to F adapter (http://www.wholesale-electrical-electronics.com/p-female-f-type-connector-to-rca-male-adaptor-gold-plated-1008090.html) on the Famicom and some proper Cable/Satellite TV grade RG-6 coax cable between Famicom and TV in order to rule out any external interference. If the picture is still bad, the RF modulator (or your TV tuner) might be weak or mistuned, on the other hand if it cleans up considerably then you probably have strong FM radio stations in your area or other sources of radio interference.