This is a basic comparision of the stock GPS ceramic antenna to a larger 4mm antenna. I have read several post about this antenna but never seen any results. I ordered three of the Taoglas GP.1575.25.4.A.02 from Digikey.com, it looks to be -3.5 db. Also I ordered a new GPS module to ensure a good comparison (ouch $175)! The installation of the new stock GPS module is just plug and play. In the kitchen of my house I would receive a solid six satellites on average of 80 seconds. Outside I would receive between seven and nine satellites on the ground, it would jump back and forth. Typically flying outside around my house I have see between ten to twelve. Then I took an old GPS module I had and removed the stock ceramic antenna and soldered in the Taoglas. Installation into the phantom shell requires trimming down some of the high ridges in the case. In the kitchen of my house I quickly received six satellites on average of 45 seconds. Outside on the ground it quickly locked in eight satellites then after minute nine. The two things I noticed most was the Taoglas locked in quicker and it didn't jump back in forth outside.