I'm surprised no one has mentioned what matters more than any of that stuff. I used to be a master control operator and all we absolutely required is black for a few seconds before the show started and an accurate length. And since you'll be paying your station to put the show on the air, they will deal with technical issues as they have to in order to get your cash (they don't accept credit.) But they will have a preferred tape format, like Digital Beta or D2. If you ask (and their engineer could tell you) they don't really like to broadcast recordings with bit rates less than 50MBS (and we all know that is twice the rate of the popular miniDV (or DV25) at 25MBS.)
However, I was able to provide a broadcast dub on U-matic for a low-power UHF station (the ones that won't be switching to digital next year.) This worked okay for us since the broadcast channel was a cable "must carry" station, so our real distribution was over cable. But really, when you walk in with cash in one hand and a tape in the other, the smaller stations will start talking scheduling. And when you walk in with an unsolicited show you want aired for the advertising they can sell, they generally show you the door real quickly.
So before you start worrying about standards for broadcast, your best bet is to be lining up sponsors. All ills and defects of your production will be solved by the simple application of cash, lots & lots of cash. But seriously, even if the dub you hand them meets network broadcast specs, it will require just as much cash. The limiting factor is not the program quality (technical or otherwise) but the revenue return they get for putting it on the air. So if you can't pay, they won't play.
Good luck & I hope this helps you focus your energy on what matters in getting a program on the air.