Sorry, missed your question about the hazard switch. Glad you got that sorted.
With the power antenna, it's pretty straightforward. You've got a DC motor there directly connected to that plug with the two terminals under the hood. If you connect +12v to one terminal and ground to the other, the antenna will go up. Reverse the terminals and it'll go down. You can test that at the antenna itself just by contacting it directly to the battery. With your up/down switch, you want to connect to ground at pin 2, and +12v at pin 4, ideally through the CIG fuse as shown (but definitely through some kind of fuse). You want to connect pins 3 and 5 to those two terminals on the antenna. Both buttons are grounded when not pressed, and whichever one you press connects to +12v, so you just connect them in the right order so that pressing up charges the motor in the right direction to make it move up, and pressing down will then do the inverse and make it go down.
I'd test this first to get comfortable with it. You can power the antenna motor directly as I said to confirm direction and that it's working as you expect. You can test the switch using the continuity setting on a multimeter. Once you've got it straight what wires you're connecting to where, it's just a matter of making those connections. You'll have to do some rewiring at the switch. You can leave pins 1, 6, 3 and 5 as they are. Move pin 4 to the pin 2 position to get your ground. You'll then need to add a new pin into the now vacant pin 4 position for your +12v. That's where a pigtail from a wreck would help. I would splice that wire into the +12v for the cigarette lighter just a little further down on the dash. From there, find the empty antenna relay connector on the passenger side kick panel. You want to connect, I believe, pin 9 to pin 6, and pin 2 to pin 3. That'll bridge the switch directly to the antenna motor contacts. I might have up/down reversed. If I do, make it 9 to 3 and 2 to 6 instead. Test it first and you'll know which way is up, so to speak.