Well, besides fog, we also go out at night here a lot - and we have lots of shipping traffic, tugs/barges, fishing boats, crabbing boats, ferries, and crazy power boaters who run at full speed assuming their radar will pick up whatever they need to see....
So I put it up high (about 35') - so according to the little booklet that came with it, people will be able to 'see' me from about 10-12 miles away....
We also have nasty currents and big tidal changes (10-15') that have to be paid attention to....so I'm just trying to eliminate any potential 'excitement'....
//sse