"above 100m" is quite relative, if I may say. What exact distance would you like to cover? On a clear line of sight without vegetative/concrete obstacles in the path, I think most ordinary WAPs will do, but remember the further you are from the WAP, the weaker the signal and the lesser the transmit speed.

I have one site where I've used a DWL-2100 AP with an outdoor antenna (can't recall the model off the top of my head) and it does over 100m. The good thing with the outdoor antenna is that the further you are from it, the wider the coverage angle. It's a directional one, if you might ask.