Here is the story according to DISH and the UPN operators (Fox 51). First of all, what I was told is that KLPN is no longer even broadcasting. It was the LP station in Longview while the new full power KCEB was being built. When KCEB came online, KLPN was shut off a couple of months later. From what I can tell, neither Longview cable company is carrying the KLPN signal. (A search for KLPN on the FCC no longer shows an active registration.) They couldn't tell me what signal DirecTV was actually using.
According to a DISH executive officer, who told me that she had the "correct" department research why it wasn't on, the station has never asked to be carried and the 75-day period in which a full-power station must request carriage has passed. She noted that they had "no plans to carry the station." According to Fox 51, they will try to "speed up getting our signal to DISH."