Quick Answer
Mount your VTX antenna vertically away from carbon fibre, place GPS antennas facing skyward with nothing above them, and keep ELRS receiver antennas at 90 degrees to each other. Bad antenna placement is the single biggest cause of poor video, GPS failures, and RC dropouts we see from customer builds coming through our workshop.
Why Antenna Placement Matters
We have rebuilt enough fpv drones to know that antenna placement makes or breaks a build. You can buy the most expensive VTX on the market, but strap its antenna flat against a carbon fibre plate and you have wasted your money. Radio signals at 5.8GHz do not pass through carbon fibre. They reflect off it, and your video range drops to a fraction of what it should be.
The same goes for GPS. A ceramic patch antenna needs an unobstructed view of the sky. Mount it under a top plate or sandwich it under a battery strap and your satellite count sits at four when it should be fourteen. We have seen builds where moving the GPS module 20mm higher cut the 3D fix time from three minutes to twenty seconds.
VTX Antenna Placement (5.8GHz)
Your video antenna matters most for your flying experience. Mount it vertically. A circular polarised antenna radiates perpendicular to its element. Lay it flat and your signal goes up and down instead of out to where you are standing. The FlyfishRC Osprey 5.8GHz we sell is designed for upright mounting to maximise horizontal coverage.
Keep at least 10mm clearance from any carbon edge. Carbon absorbs 5.8GHz. A LiPo battery next to your antenna is equally bad. For a solid transmitter, the TBS Unify Pro 5G8 HV (SMA) paired with a quality antenna from our antennas collection is our go-to recommendation.
GPS Antenna Placement
GPS modules at 1.575GHz use directional ceramic patch antennas that point straight up. Get this wrong and you get long satellite lock times and GPS rescue that fails when you need it.
Face the ceramic patch skyward with nothing above it. Not a top plate, not a battery strap, not a GoPro mount. We put GPS modules on top of every long-range build that leaves our workshop. Yes, it is exposed in a crash, but a working GPS beats a protected one. A 3D-printed cover gives enough protection.
Keep GPS at least 30mm from the VTX and ESCs. Our rule: GPS at the rear top, VTX antenna at the rear bottom. See our GPS modules guide for more.
RC Receiver Antenna Placement (ELRS 2.4GHz)
ExpressLRS at 2.4GHz uses diversity receivers with two antennas. The RadioMaster RP1 V2 and similar receivers need their antennas at 90 degrees to each other. This ensures at least one antenna has good alignment with your transmitter regardless of drone orientation.
Keep at least 40mm between VTX and RC antennas. The VTX output overwhelms a nearby 2.4GHz receiver. Route coaxial cables with gentle curves, never sharp bends. A kink changes impedance and degrades signal.
Common Mistakes We See
After repairing hundreds of builds, these errors come up every week:
The antenna sandwich: VTX antenna between top and bottom plate with a battery strap over it. Five minutes to fix by moving it to a mast mount.
GPS under the battery: Tucked under the battery pad for a tidy look. The battery blocks half the sky and the GPS never locks properly.
Parallel receiver antennas: Both ELRS wires running the same direction instead of 90 degrees apart. This one change can double your RC link reliability.
FAQ
Q: Can I mount my VTX antenna horizontally?
A: You can, but you will lose significant range. Horizontally mounted antennas radiate mostly up and down. Vertical mounting gives you the best signal where your goggles are.
Q: How far should the GPS be from the VTX?
A: At least 30mm, ideally more. The VTX is the strongest RF source on your drone. We put GPS at the top rear and VTX antenna at the bottom rear.
Q: Do antenna rules differ for analogue vs digital FPV?
A: The physics are identical at 5.8GHz. Digital systems like Walksnail use patch antennas on the goggle side which are more directional, so VTX placement matters even more. See our polarization guide and antenna choosing guide.