IC-R6 does not support SSB. And that rubber ducky antenna
would do you no good even if it did.
Any decent general coverage shortwave receiver will work
BUT you need to set up a good antenna.
My experience with analog weatherfax over HF has been spotty. The image gets distorted by atmospheric noise
and signal fading. Do you intend to have any other HF communications
on board? Where are you cruising? There are much better alternatives, unfortunately they are more expensive.
NAVTEX - short range for coastal use.
WINLINK - License
required but Ham radio
offers so much more.
SSB sailmail - pricey and requires a marine
SSB radio and expensive modem
- also pricey but costs have come down.