"Fractenna" wrote in message
...
I regularly use an active 41" monopole to accurately measure electric
field
strength over the range of 10 kHz to 30 MHz. That's a ratio of 3000:1, and
that is 25-year old technology.

--
Ed
WB6WSN




And your variation of gain, excluding mismatch, is...?

73,
Chip N1IR



Maybe I gave you a trick answer, because the antenna I cited is a
receive-only device. It is concerned only with measuring the strength of the
electric field, and derives no phase information. I'm sure its efficiency is
horrible, but its bandwidth is huge and its gain is about +/- 0.5 dB.

FYI, here's an example of this style of antenna:
http://www.ets-lindgren.com/productp...ttype=Antennas

Even if it did not face into an active pre-amplifier, it would still be a
poor emitter anywhere below a few MHz. Electrically short is something that
hasn't been finessed yet.

Ed
wb6wsn