Six

The quality of this may not be good but that's because it was far away and I've cropped the picture.
The helicopter has a large "bucket" underneath it ( a small black dot!). It is collecting water usually from the sea and dumping it on a fire inland, often in the bondu or bush areas. Everything here is so dry that once a fire gets hold it will literally spread like wildfire! The helicopters had been at work for about 5 hours when I blipped this and the smoke in the sky was dissolving.

I think there are 6 aerials in this blip...if I counted correctly.