Thursday Morning Riddle

I’m a signal that’s found on a frequency band;
I’m the flutter of flags; I’m to hail with your hand;
A disturbance in water that crashes on land;
And when stadium sitters sequentially stand.

Who am I?

UPDATE: Riddle solved by DeLisa. See comments for answer.

2 Responses to “Thursday Morning Riddle”

  1. DeLisa Says:

    Wave! :)

  2. Bill Says:

    WAVE is correct. Way to go, DeLisa!

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