In this context, short antennas have a very low radiation resistance, so other losses tend to dominate, and you lose a lot of power as heat. A transmitting antenna is designed for efficiency: to send as much of the input power out as radio energy as possible. This article points out something which may not be entirely obvious until one thinks about it: antennas designed for transmission and reception have different goals. PA0RDT has developed a simple active antenna which has intrigued me. Because of a lack of suitable trees on my property, this means that I’ve had fairly compromised setups: I’ve gotten the most use from a simple 40m dipole which probably only averages about six meters in height.īut at least for receive there might be an interesting alternative. This means that I have to be fairly careful to use largely invisible or stealth antenna setups. Like many people, I live in a development with a fairly restrictive HOA.
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