Radio Underground 6323 Khz Radio Underground is on 6323 Khz at 1709 Utc with SINPO 44433. Soon fading out at SDR Twente at 1726 Utc: Share this: Share on X (Opens in new window) X Share on Facebook (Opens in new window) Facebook Email a link to a friend (Opens in new window) Email Print (Opens in new window) Print Related