I have a DX-392, currently inoperable, and a Sony ICF-7600, which works fine but is mostly useless on shortwave due to high levels of manmade noise. I'm also on the top floor, but that doesn't help in a multi-tenant apartment building with fluorescent lighting in the hallways!I was using my Grundig G2 off the whip. The G2 off the whip hears anything my DX-398 receives off a 25-30 ft indoor wire antenna... maybe losing a dB or two, but I use the G2 for convenience. If I clip the 25 ft wire to the whip sometimes I gain a dB, and sometimes I just get more noise than signal. The G2 sounds a little better on SW, too, which helps. When I first got it I was surprised at all that I was hearing. My DX room is on a second story, so that probably helps, too.
My favorite portable receiver ever was the Sony ICF-6500, the hybrid with slide rule tuning and digital readout. I gave it to my brother as a going-away gift as he left for college and never got around to buying another.