The USCG operated a Loran-C station in the far western OK panhandle near the TX state line. I looked it up the other day and it appears the tower and support building still exist, at least according to the aerial photo I found.
It went off line and was decommissioned about 12 years ago. Sad.
Some squirrely space junk hits our GPS system and we will be wishing Loran back big time.