This is just another example of something I have always said and believed. If you are an air talent at any radio station, you better be a juggler.
By that I mean, you should have at least three things going at all times. Your on-air gig being the main income source, and one or two "side-gigs" to supplement. When times are good, it will be extra income to sock away for a rainy day. If any one of them suddenly goes away, you are not left getting "rained on". If the unfortunate happens, you lose the main air talent gig, (which does sometimes seem to happen for no real reason - budget cut, ratings drop, new boss that doesn't "get" you, etc) - then you have something to keep you afloat.
Voiceovers from a home studio, voice-tracking for a station or two outside your market, mobile DJ, schedule music for another station, web design, or anything non radio related too. There are many ways of supplementing income.
The other smart thing to do is save 25% of your take home pay. That's more aggressive than even most financial planners suggest, but this can be a volatile business at times and the extra cushion of savings can be a life saver. It is hard to do because of temptation, but it is a smart thing to do.