Radio Waves International 6420 Khz Tentative RWI Radio Waves International is on 6420 Khz at 1400 Utc with SINPO 23322. Share this: Click to share on X (Opens in new window) X Click to share on Facebook (Opens in new window) Facebook Click to email a link to a friend (Opens in new window) Email Click to print (Opens in new window) Print Related