The no reception situation of WPMT is likley signal reflections from , trees , buildings , mountains. Try turning the antenna to the left and right for better reception. Having the antenna at a different angle can reduce a signal reflection. Also try raising and lowering the antenna. Also try the double rescan suggested at
http://www.dtv.gov . Also use a coax grounding block to ground the shied of the coax to earth ground , this directs unwanted signals to earth ground and keeps them out of the Tv tuner.