I have had good luck on a couple of them. The AOR 320 (limits out at 15 MHZ) with replaceable loops. Still available from used places. The newer AOR's are better and more expensive. What I am using now is 2 Metal Slinkys@ strung as a dipole fed in to a 1:1 Spiro Balun. This works very well and no need to re-tune going band to band. Have used one for over 20 years. the AOR I maily use on MW and tropical bands.
The Grundig Satellit 800 already has a built-in Pre-Amplifier
that is used with the built-in "Mega Size" Whip Antenna.
{ The Built-in Whip Antenna is an Active Antenna. ]
The Grundig Satellit 800's Whip Antenna is a design for an
earlier age of radio when Whip Antennas were Designed and
Engineered to be real Signal Gatherers: Large and Long and
Thick at the base and tapering to the tip. The majority of
today's 'portable' AM / FM Shortwave Radios have short and thin
Whip Antennas; which provide minimum Signal Gathering. The
Grundig Satellit 800's Whip Antenna is "Mega Sized" when
compared to the average much smaller Whip Antennas on most
of today's smaller 'portable' AM / FM Shortwave Radios. Plus
with the Grundig Satellit 800's you have the built-in Whip Antenna
Pre-Amplifier for add Signal Strength.
IMHO: The Size and Shape of the Grundig Satellit 800's built-in
Whip Antenna is about the Signal Gathering equivalent of one of
those 23 Feet Reel {Role-Up} Antennas that are required by most
other 'portable' AM / FM Shortwave Radios to get the same Signals
that the Grundig Satellit 800's provides with the "Mega Size" Whip
Antenna and built-in Pre-Amplifier.
QUESTION - So Why Use 'another' In-Door Active Antenna ?
When your already have "Mega Size" Whip Antenna and a
Pre-Ampliers built-in to the Grundig Satellit 800 Radio ?
First - Check-Out the Grundig Satellit 800 Millennium Group on YAHOO !
SATELLIT 800 =
http://groups.yahoo.com/group/Satellit800/
Second - Read any and all of these Messages about
using Antennas with the Grundig Satellit 800 Millennium.
* Concerning the Grundig Satellit 800 Millennium's
"Mega Size" Whip Antenna with Pre-Amplifier for
Shortwave Listening. READ "GS800M's Whip Antenna"
http://groups.yahoo.com/group/Satellit800/message/4176
* One of the Grundig Satellit 800M's - Secrets for Top Perfromance
http://groups.yahoo.com/group/Satellit800/message/6093
http://groups.google.com/group/rec.r...6c0eca10bc3f17
* Grundig Satellit 800 Millennium Radio -
Do I Need an External Antenna ?
http://groups.yahoo.com/group/Shortw...na/message/508
* Antenna Options for the Grundig Satellit 800 Millennium Radio
http://groups.yahoo.com/group/Shortw...na/message/486
{ And the Parts that are required Cost Under $5 }
* Improving the Grundig Satellit 800 M's AM/MW Reception for DXing
http://groups.yahoo.com/group/Shortw...na/message/865
* Pair of Active "InDoor" Antennas for AM/MW and SW Reception
http://groups.yahoo.com/group/Shortw...nna/message/87
Both work well with the Grundig Satellit 800 Millennium Radio.
One for AM/MW and the other for Shortwave.
..
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hope this helps - iane ~ RHF[/quote]