I see IRC a good idea to supplement a live feed, an event in progress, or those things not worth archiving.
Other items, such as tips, antenna construction, frequency information, etc, are worth archiving and therefore should probably remain in the forums.
As far as IRC goes, with all the free sites around, I feel RR doesn't really need to set up it's own IRC server.
All we need is the approval of RR, and a spot to list the link for the IRC server/channel, and the flexibility to post/remove the link when events dictate.
This could probably done easily under the existing Feed Provider Link for those running live streams.