Create a vertical mystery teaser on the apartment rooftop shown in Image 2 during an approaching storm. Preserve the adult technician from Image 1: shaved hair, orange waterproof jacket, black gloves. Preserve the receiver from Image 3: compact metal box, fold-out antenna, analog needle, one green indicator.

Opening: technician kneels beside the receiver while distant clouds pulse with silent sheet lightning; camera slowly rises from the green indicator to the face. Middle: the antenna rotates by itself exactly twenty degrees, the analog needle moves in three measured steps synchronized to Audio 1, and the technician removes one glove to feel a faint vibration on the metal roof. Ending: technician looks toward a dark neighboring building; one window answers with the same three green pulses, then all rooftop power cuts out and the frame holds in natural darkness.

Sound intent: wind, antenna servo, three-note signal, sudden electrical silence. Avoid visible aliens, magical beams, unsafe lightning strike, changing receiver design, extra windows flashing, text overlays, or watermark.