If the rod does anything at all, it increases the effective length of
the antenna. You can accomplish the same thing by physically increasing
the wire length. And all that will do is to increase the amount of
signal -- and noise -- entering your receiver. Once you have enough
signal and noise to overcome your receiver's internal noise, there's no
advantage of any further increase, since there's no improvement in the
signal to noise ratio. Try disconnecting your antenna from your radio.
If the noise level drops when you do, you've got adequate signal
strength from the antenna, and lengthening it -- either physically or
with some kind of loading -- won't help you hear signals.

The explanation of the properties of the antenna at the distributor's
web site is wholly hype and sales marketing. It's a mismash of misused
technical terms, which means nothing and and is quite apparently
intended to mislead a potential customer and present the antenna as
having wonderful properties which it doesn't in fact have. I'd avoid
buying it for that reason if for none other.

Roy Lewallen, W7EL

RHF wrote:

FO&A,

Here is my Question: Is there any sense in putting a Ferrite Rod
at the Far-End of a Random Wire Antenna with the Wire from the
End of the Wire Antenna Element 'wrapped' around it in a
"Tuned Coil" to improve the AM/MW Band Reception ?

* Any 'theory' behind why this Idea might Work ?

* Does this Idea actually Work ?

* Or is this Idea just so much Antenna 'hype' and Sales Marketing

I am Asking these Questions is because of what I have read about
the RF Systems "EMF" Electro-Magnetic-Field Passive Wire Antenna
http://www.universal-radio.com/catalog/sw_ant/0743.html

In "John Wagner's Shortwave Tips & Tricks" he writes:
http://www.dxing.com/tips.htm
"The EMF antenna has two 35mm film canister looking objects
connected to it. The canister on the Far-End is actually an
excellent "Tuned Ferrite Rod" designed for MW (Medium Wave)
and really helps any receiver without a built in MW Antenna
Rod. Canister two (in middle) is a Balun that helps SW
reception very much."


i want to know ~ RHF
.
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