The internal codec is not good enough for broadcast - you can quite easily see compression artefacts even with mild colour correction.
The camera has a HDSDI output and there are plenty of external recorders that can record in a broadcast friendly codec.
Prores 4:2:2 or HQ - would be plenty good enough. You use the external recorder as the recorder - so it has to be connected the whole time. Most external recorders are quite small or are built into field monitors, so easy to mount to the camera. Personally, I've used the Blackmagic hyperdeck shuttle with AF101 - but check out ATOMOS stuff as well
Be careful to turn the viewfinder display off on the HDSDI out or you'll record it (made that mistake once with a AF101 and Hyperdeck Shuttle)
If it was me - I'm not a big fan of the AF-100 - even with the external recorder. Newer cameras are much better and many record in a broadcast friendly codec so you don't have to mess around with external recorders eg: Canon C300, Sony FS-7, anything by Blackmagic etc... Makes life a bit easier and you don't need to extra power source for the recorder