Did you know air traffic control will advise you of “traffic” that’s on the ground? (Well, sort of)
Years back, flying a Piper Seminole, I ferried one of our flight instructors to NE Iowa for the Ragbrai (a large, state wide bike ride). After dropping him & his bike off, I headed east returning to Chicago, and not long after taking off and reaching a cruise altitude of 3,500’, ATC advised of “traffic at your two o’clock, five miles at three thousand feet.”. My eyes strained a bit, scanning the sky for an aircraft. Instead, I found myself staring at an enormous radio tower. Until then, I had no idea there was any man-made structure in the Midwest taller than the Sears Tower, nor did I realize ATC would call out such “traffic”.
For those not in aviation, referring to the included chart, the larger, bold number on top reads the obstacles height above sea level, or its height were you to climb to the top with an altimeter. The smaller number (in parentheses) is the height of the obstacle above the ground.
For reference, the Sears Tower is 1,451’.
And before you say “AKshUaLLy, it’S tHe WiLLis ToWEr!”, I refuse to call it by anything other than its original name.