So far I have found two websites concerning this mod: http://jerryphpics.blogspot.com/2008/07/004-cactus-v2s-modifications.html http://jeremykuster.blogspot.com/2007/10/gi-cactus-v2s-modification-tutorial.html Both of them have good write ups, however something doesn't make sense. In the first website, they said to solder on the "antanna" onto the bottom left corner. On the second website, they soldered it onto the bottom right(next to the battery). When I soldered it on the bottom left with a simple coiled wire, it didn't work (lost distance actually). See figure a1 below. figure 1a - my attempt I decided to take it off since it didn't do anything. Btw... was that circuit important? Did I damage it by any chance? It still works... Normally, the cactus is really inconsistent after a few feet away. Even from ten feet it may miss 1/10 tries or more. With the DIY (from the first link) loop wire antenna, I lost range. This may be because thats not how antennas work (at least from how I learned) OR it's not the correct antenna circuit. I then held the same wire on the other circuit and tested roughly 100 feet away and it worked (somewhat). When I took it off, it no longer worked. This must mean that the bottom right circuit is for the antenna. Can someone still confirm this please?