RHF wrote:

PINOT,
.
If you are on the 10th Floor of a Concrete and Steel Condominium;
Check your 'metal' Window Frames; they may provide a reasonable
Ground when no-other grounding point is available.
.
The Sony ICF-SW77 AM/FM Shortwave 'portable' Radio
http://www.universal-radio.com/catal...able/2493.html
http://www.universal-radio.com/catal...e/2493cont.jpg
http://www.universal-radio.com/catal...e/2493freq.jpg
http://www.universal-radio.com/catal...e/2493time.jpg
http://www.dxing.com/rx/icfsw55.htm
http://www.universal-radio.com/used/u080sys.jpg
http://www.universal-radio.com/used/u079sys.jpg
.
IIRC - The Sony ICF-SW77 uses an 1/8" Mono Jack
for an External Antenna Input.
http://www.universal-radio.com/catal...e/2493back.jpg
http://www.universal-radio.com/catal...e/2493side.jpg
.
No-See-Um Vertical "Drop" Shortwave Antenna :
For a simple 'external' Random Wire Antenna you may wish
to try building a No-See-Um Vertical "Drop" Antenna.
Basically a Vertical Wire Antenna that is "Dropped" out
your Condo's Window and just hangs there.

snip

Thank you for a detailed description; I tried the drop wire earlier.
It worked, but not as good as the original built-in whip out of the
window; I got somewhat better results with a whip under a moderate
angle pointing upward, like a penis in erection, something like that.
Is it because the antenna under the angle picks less noise, or is it
something else, I can't tell, I don't know.

So I decided to build an "external whip", and asked will an equally
long peace of wire through the window do the job equally good as a
whip, maybe CB whips are worth purchasing if they are making whip
antennas with silver in the alloy for better conductivity, or do other
tricks in production process to increase reception performance ?

Since replies suggest to stick with a wire, yesterday evening I
completed a bamboo stick with a wire within, and it works as expected.
I don't use a window frame as grounding point, the frame is made of
aluminum. Few weeks ago I visited a local flee-market and found a
piece of iron previously used as a weight for live-stock scales. Works
good.