How can I separate an 8H antenna from a modified 1×1 with ring?
Ah, yes. I have had this problem a few times. Here's what I do:


The first thing you're going to want is leverage. Connect one 1x6 plate to the underside of the Modified 1x1, one on top of the previous plate (but adjacent to the Modified 1x1), and one on top of both pieces.

Next, slide propeller piece 32125 over the tip of the antenna.

Hold the antenna upside-down (vertically), with the 1x6 assembly in your right hand. Move the propeller piece all the way up, but stop before it gets to the section the Modified 1x1 is on. Maneuver the antenna's stem into one of the four sides of the axle hole on the propeller piece, tilt it at an angle, and push up. There should be a slight pop and the 1x1 will move down the antenna.

Now that you have something to push on, simply remove the propeller, grab hold of the 1x6's with your right hand, and press into the base of the antenna with the propeller piece. It should pop out the rest of the way and then you're done!

Why does this work? Well, the propeller piece is perfect because it had a proper diameter to fit over the round tip, and the sides of the axle hole are a prefect dimension to hold the smaller thickness of the antenna stem, thus giving you a contact point for applying pressure. I suppose it's a bit over complicated, but it works for me. :)