Once, just before takeoff in an A-37, I found out that my radar transponder was inop. There was about a 1200 foot overcast, and since I was flying a low-level route anyway, I elected to just cancel my instrument flight plan and take off VFR (visual flight rules).
I got airborne, leveled off just below the ceiling, and headed for the entry point. About five minutes after takeoff I was feeling pretty proud of myself when I caught just the faintest glimpse of a light straight ahead. I stared at the spot, and sure enough it flashed again, this time accompanied by others above and below. As I approached at about four miles a minute, I realized in short order that it was a TV antenna, that it went all the way up into the overcast, that it was surrounded by guy-wires, and that there were three of them, smack dab in front of me and getting bigger fast. I made a hard turn and missed the left-most tower and its wires by just a few hundred feet.
That day I gained a new-found respect for the guys who keep those strobe lights in good working order.