From another forum….
“I believe its part of the static-discharge system that protects the aircraft. All Boeing jets have it, some choose to paint over it with an static dissipating paint, but for some reason, it was left on the 757. Airbus have them hidden from view I think.
I believe also that they were designed to be apart of the MLS (Microwave Landing System) which were supposed to replace the ILS before 2000. The MLS was deemed more advantageous as it allowed pilots to fly curved precision approaches (when terrain was a problem). Pilots just have to fly non-precision approaches for the unconventional approaches. The idea was scraped – I don’t know why”.
Not my words, I hope he doesn’t mind me using it.
😉
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