Though I normaly really dislike the cold weather (as does my 17-year-old Golf Diesel which is supposed to take me to work), the one good thing about frost is the improving LF-antenna performance. Series loss resistance goes down by 1 to 2dB, and surprisingly, in addition to that I seem to get another 1dB from increased effective antenna height, as measured by comparing received voltage against a non-resonant loop. There are a few high fir trees in the vicinity of the aerial, and I assume that under heavy frost, the shunt conductance of the trunks falls below the capacity of the tree crowns, so that electrostatic shielding is significantly reduced.