In article ,
Larry Dighera wrote:

The KFI radio tower is a little over a mile NW of Fullerton Airport.
There is often haze in the vicinity, and viewed against the ground,
the tower can be less than conspicuous. If I recall correctly, it is
not freestanding, but guyed. I make a specific effort to locate the
tower whenever I'm operating in the vicinity, because I am aware of
its insidious nature. Because the tower is 760' AGL, aircraft at the
standard traffic pattern level of 800' are vulnerable. One just
doesn't expect such a tall tower in such close proximity to an active
airport.

Towers can be very hard to spot in the haze. There is a 1500ft
tower on the top of a 2500ft ridge between Watsonville (WVI) and
South County (E16 (formerly Q99)). On a clear day, it isn't easy
to see. With fog/haze, it becomes invisible.

I took these shots on a somewhat hazy day:

http://www.panix.com/~jac/spot-the-tower/

There are strobes on it, but the tower itself is a flat grey, which
is very good at blending into the haze/fog.

John
--
John Clear - http://www.panix.com/~jac