> I agree with markxxx. Anchorage has full-power 2, 11, and
> 13; Fairbanks has full-power 2 and 11. So where would a
> signal problem exist on 13 between Anchorage and Fairbanks?
Indeed, channel 13 was allotted to Fairbanks so the FCC certainly considered it possible to have a full-power channel 13 there without interference.
According to
this site before June 2003 a full-power TV duopoly was only permitted if there were at least nine full-power TV stations in the market. Of course, that condition isn't met in Fairbanks! Even under the new 2003 rules, a duopoly cannot include two of the four highest-rated stations. Fairbanks has only five full-power stations, and I think one can probably reasonably assume K13XD (or whatever their calls would have been as a full-power station) gets better ratings than KUAC and KJNP...
In any case, by the time the new 2003 rules were adopted, the FCC had frozen applications for new full-power stations, in anticipation of the DTV conversion.
It is an interesting & valid question as to why no other company applied for a full-power station on channel 13. Another full-power applicant could have bumped K13XD from the channel. I suppose nobody felt the market was big enough.
Today, it's too late. The freeze on new-station applications will probably continue for at least five more years until the DTV situation gets straightened out.
K13XD isn't at as much of a disadvantage as they'd be in a Lower 48 market. There's plenty of space, so they're not going to lose their channel to someone's DTV; and their "full-power" competition isn't running anywhere near the maximum permissible power. (their 3kw is only about 10dB below co-owned & sited KFXF-7. I'd bet their coverage radius is actually *better* than that of full-power KTVF and KATN, whose antennas are *really* low. Though I do get the impression Fairbanks is a market where terrain does weird things to signals...)