Radio Underground 6300 Khz Radio Underground is on 6300 Khz at 2115 Utc with SINPO 23322. Moved to 6288 Khz at 2135 Utc to avoid station on 6295 Khz. 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