what are all of the listed transmitters?
allenheads, alston, bellingham, blaydon burn, byrness, catton beacon, durham, esh, felling, fenham, haltwhistle, haydon bridge, hedleyhope, humshaugh, ireshopeburn, kielder, morpeth, newton, seaham, shotleyfield, staithes, sunderland, wall, weardale, whitaside
and their pol. values?
v, v, v, v, v, v, v, v, v, v, v, v, v, v, v, v, v, v, v, v, v, v, h, v, v
which transmitter's pol. value is h?
wall