Tuners normally have analog outputs, which can be connected directly into your powered monitors.

You can use a stereo audio switch box to switch between the tuner outputs and your Vega DAC outputs (and a couple of other sources if desired).

Get the Cables To Go #28750 Audio Switch Box, which is $19 from Amazon. It has 4 sets of inputs, which will allow you to switch between up to 4 stereo audio sources with the switch box outputs connected to your powered speakers, just by pushing a selector button (it also has video jacks, which you will ignore and not use).

I suggest that you consider getting the Grace Digital Solo Internet Tuner, which is pre-programmed with over 10,000 stations, including your local ones. You can select stations by country, region, musical genre (or talk or news etc.) and other lists. It can be hard-wired to your modem or will connect by wi-fi if you have a router. Amazon, Wal-Mart, and Target sell it (among others).

It only costs $120 or so, and is a wonderful gizmo. It has its own screen and you can preset 10 stations on it. I love mine; I listen mostly to classical from Boston and Minnesota and New York, but there is an endless variety of music from all over the world.