If you give control of the antenna to Frank at the end of the Broadcast story quest in Dying Light 2 Stay Human then, when you complete the next story quest, The Shoe, the Nightrunners story quest will begin. Your first objective is to meet Frank in the Fish Eye, so go ahead and do that. Agree to go and activate the military antenna, then follow the yellow marker to the building, and use the lift on its northeast side.
Go west, then climb up onto the platform, and use the platforms, horizontal bars, and grapple points to make your way up around the outside of the building. Pretty soon you’ll come to an office with an Inhibitor container in it, so be sure to stop off and pick that up. Grapple three times in a row to get around the next corner, then climb up, and go inside again.
Climb up the elevator shafts to get up a few more floors further up then, after a few more offices, you’ll be outside again. Continue up and around in the same way as before. If it feels like you’re doing the same thing again and again, then you’re probably going the right way, but eventually you’ll come to something different: a vertical air vent shaft. Climb up it to reach the roof.
Grab onto one of the rotating parts of the tower on the southeast side, then shimmy up it and climb up to the platform above. Grapple to the tower to the northwest, and kick the ladder down (that’ll be a shortcut if you fall). Use the zipline to get across to the northeast tower, then use the rotating poles to get to the top. Grapple south to the tower on the far side of the roof, kick down the ladder, then climb up a couple more rotating poles. Jump to the yellow ledges around the top of the tower, then climb onto the top platform, and activate the antenna, thus
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