Abstract: An improved antenna field has at least one capacitance switched between one of the two bus bars. At least one center section of the heating wire is formed between 20% and 80% of the total length of the heating wire, and/or at least one capacitance is switched between at least two center sections of the heating wires formed between 20% and 80% of the total length of two heating wires. The at least one capacitance is greater than 50 pF.

Abstract: An improved HF socket or HF plug socket for connecting to a coaxial wiring system comprises an integrated monitoring means comprising a monitoring circuit arranged in a feed path extending in the HF socket between an interface for connecting a receiver and a junction to the wiring system or to the single-cable system. The monitoring circuit comprises a cut-off or interruption means by which the feed path is interrupted when a direct-voltage signal originating from a connected receiver is applied with a voltage above a threshold voltage for feeding into the wiring system or into the single-cable system over a predetermined or preadjustable period of time (?).

Abstract: An improved HF socket or HF plug socket for connecting to a coaxial wiring system comprises an integrated monitoring means comprising a monitoring circuit arranged in a feed path extending in the HF socket between an interface for connecting a receiver and a junction to the wiring system or to the single-cable system. The monitoring circuit comprises a cut-off or interruption means by which the feed path is interrupted when a direct-voltage signal originating from a connected receiver is applied with a voltage above a threshold voltage for feeding into the wiring system or into the single-cable system over a predetermined or preadjustable period of time (T).