Karl Rothammel (1914 – 1987) was an amateur radio enthusiast, author and educator. He published articles in the journal Radioamatér for five years, and authored several books [1] including Very High Frequencies and Practice of the Television Aerials. Rothammel was born in 1914 in Fürth, Bavaria; he died at the age of 73 in Sonneberg, Thuringia (then part of East Germany). Y21BK was his last amateur call sign.