What would Be the best REALISTIC location to defend?
Probably a farmhouse. Not a "LOL I R IN TEH MOUNTINS AND I TEAKE LIEK 300000 DAYS TO WAK HERE SO NO ZOMI CUD GET MEH EVAR" farmhouse, just a house on a decent sized field. They aren't too uncommon, unless you live right in the center of a big city. I can get to farmland from my house in about 10-15 minutes driving. There you will have a long line of sight all around you, so any zombies that do come can be dispatched of with relative ease. You way also find other goodies there (small rifle, perhaps a .22 or something like that, a rain catcher, crops that are still edible, cattle). Also, since you aren't that out of the way, you can still make your way back in to town, should the need arise for whatever reason.
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Please bold the "Y" that indicates the starting position, it just makes it that much easier.
Anyways, you seem to have a straight path to the gong. There's only one zombie near you who you can easily circle. Get to the gong and hit it, all the zombies will begin to look at it, and more than likely move towards it. Now, there's to separate outcomes to this.
House doors are closed:Okay, so those zombies won't be bothering you for the meantime. You just need to avoid the north-western group of zombies. Back up (West) and try to run behind them. There's no point going behind the house, you'll just get cut off.
House doors are open:Same as before, but now you have to run behind the group of zombies but in front of the ones in the house as they leave. Same concept, but much riskier.
Also, it may be worth noting where the doors are.