http://elecraft.85.s1.nabble.com/Off-Topic-Your-advice-suggestion-about-antenna-tp7658892p7658997.html
> On 3/17/2020 3:30 PM, Lyn Norstad wrote:
>> One simple post, Bob, and you've covered pretty much everything
>> anyone needs to know about wire dipole-type antennas.
>
> NOT! While non-resonant dipoles are certainly viable transmitting
> antennas, there is FAR more to know about them, including:
>
> 1) Their directional patterns are different on every band;
>
> 2) They have very poor rejection of common mode noise on the feedline
> unless choked at the FEEDPOINT (i.e. where the feedline connects to
> the horizontal wires) and I know of no practical choke to do that
> effectively.
>
> 3) #2 is true because in the common mode circuit, the feedline is part
> of the antenna unless the choke disconnects it, and it can only do
> that at the feedpoint. The only thing that a choke can do farther down
> the line is add high impedance to that common mode circuit, creating a
> current minima at that point. Remember, it's an ANTENNA, not a simple
> series circuit.
>
> 4) A well-balanced transformer coupled tuner CAN present an open to
> the common mode circuit, but the rest of the feedline is still part of
> the antenna, so any common mode noise received on the feedline is
> coupled to the antenna, and from there back down the feedline as a
> differential signal.
>
> 5) Many years ago, N7WS published his research showing that window
> line gets pretty lossy when wet. It's in one of ARRL's excellent
> Antenna Compendiums.
>
> Bottom line -- this is one of those antennas that "works," but how
> well it "works" depends on your local noise level and whether the
> station(s) you want to work are in one of the nulls of its pattern.
> It's one of those antennas that was a lot better idea 20 years ago
> when it was highly advocated by smart engineers when noise levels were
> a LOT lower for most hams than they are today.
>
> 73, Jim K9YC
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