Inge,

I'll wait for the photos, but an antenna is an antenna. It can either be
resonant at a particular frequency or tuned by an antenna tuner as needed.
Probably for a wide coverage receiver a long wire antenna is the easiest
place to start. The longer the better, up to a certain point. 

If you are interested in a particular band of frequencies, a dipole works
well, but tends to be directional - not necessarily a bad thing. 

For 28 MHz I've used dipoles that are roughly 5.8 meters on each leg. The
length varies inversely with the frequency, so at 3 MHz the dipole would
need to be 58 meters or so. But any piece of wire will work, some will work
better than others.

Once I see the photo I'll refine my comments.

Blair

On Sun, 27 Feb 2011 14:57:42 +0100, Inge Hernefjord <[log in to unmask]>
wrote:

>Hi, when I left the navy decades ago, I missed my radio equipments. However,
>I succeded to save one traffic receiver as you can see on the photo (if
>Steve can give a hand). This machine is of course stonaged and hopelessly
>behind technology of today, but of nostalgic reasons I would like to give it
>a try. I've spent some money for service and now the receiver can work.
>
>Now, I've little knowhow about aerial antennas for 380 Kc/s to 30 Mc/s. I
>remember I had a network of copper lines across the destroyer, but know
>nothing of the design.( Had to be repaired frequently after shooting with
>the anti-aircraft artillery).
>
>So, to the question: Anyone familiar with the GEC 400S? How would a modern
>antenna look like and what kind of tuning and compensation is necessary ?
>I've contacted some DX guys, but they know nothing about this antiquity.
>
>Wait for the photos.
>
>Inge
>

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