This was a custom, exclusive product created by the industry leader in FPV antennas specifically for tinywhoop.com and the Tiny Whoop aircraft.
This antenna is hand-made and hand-tested by the professionals at Video Aerial Systems. Made from bent wire as opposed to the popular stock stamped metal antenna, it is incredibly durable and will be very hard to break. When I made my FPV setup in the photo below the total weight addition was 0.227 grams, a great trade-off for the huge increase in quality and durability.
Modifying your antenna is pretty easy.
First, de-solder the current antenna from the vtx. Take a look at how it's held on in three places - there are two outside connections which are the ground (soldered to the same pad on either side) and there is a single lower connection.
Now we'll make the upgrade antenna look like that. First cut your antenna about this short. If you want a little room to make mistakes, go a couple millimeters longer.
Gently remove the outermost translucent material to expose the woven ground wire.
Once the outermost translucent layer is removed, slowley pull apart the woven ground wire and twist it into the two outside connections. As you'll see these will need to be a bit shorter than the central wire. Remove a bit of the white insulation between the core wire and the woven ground wire so that it looks like this.
Now just solder the central wire to the lower pad and the two ground twists to the ground pad. Easy as pie!! Just make sure they're not touching in any place and you should be good.