Almost all modern buildings contain lots metal parts inside. For example,
any building has water pipes (as a rule copper), main wires, telephone
wires, inner metal skeleton. Some building has a water (steam)
heating system. The hidden metal parts can work as transmitting
antenna. You only have to connect your transmitter to the metal
in proper way.
In this article we discus antennas based on domestic water heater system.
Let’s name the antennas ‘Water Heater Antenna System’, or just
WHAS. Certainly, diagram directivity and efficiency of WHAS often
are far from desirable. Anyway such antennas allow ham to be on
Base of WHAS
Water steam pipes, which go from down to up through a building, create
hidden metal structure. The question is: in what manner we can
connect to the pipes in order to these ones work like an antenna.
Below we discuss several ways how to do it.
Before you go to create your own WHAS please keep in mind the advice.
Do not use powerful TX, limit your power to 50 (and below) watts.
At large power, at first you may do a burn to your neighbors,
at second large power can create unhealthy electromagnetic environment
at your place.
My experiments show that
there is no big difference in operation between WHAS designed
either in brick