Hello Slade:
I also used a 398 (Sangean 909 same innards) for a number of years
together with sundry other portables and a Radio Shack
DX 394. The 750 outperforms any other radio I own, mainly due to the
use of a good outdoor antenna, although the DX 394 makes a good
account of itself with this antenna, a Hustler 5BTV vertical, ground
mounted. Really a Ham antenna, but exceptionally effective on SW. Your
selection of the new antenna will amaze with the improvement in
reception. My location is electrically very noisy, but the outdoor
antenna made a huge improvement in reception.
Noise levels dropped dramatically and DX hunting became a real joy.
Good Luck with the new antenna and Good Listening from SW4ever...