ADS‐B groundplane
- N socket
- 40cm copper wire (1.5mm² or better 2.5mm²)
- 4 M3 bolts and nuts (you may want to add washers)
- SMA -> N RG58 cable to connect it to your bandpass filter and rtl_sdr (length depends on your setup, the shorter the better, we usualy use 1m)
- Soldering iron + solder
- Wrench for the M3 nuts or pliers
- Wirecutter
- Screwdriver for the M3 screws
We use a NanoVNA to check our Antennas.
As you can see the SWR@1090mhz is 1.13:1
Cut 4 about 8cm long copper pieces and create a loop on each end which is big enough for a M3 screw.
Solder the loops end for more stability.
Cut one 8cm long copper piece
and solder it into the antenna jacks middle pin.
Screw the four pieces withe the loops to the antenna at an 45° angle
and bend them down 45°.
The 5 pieces of copper are a little bit to long for 1090MHZ by design so you can tune it perfectly by shortening them with the help of a nanoVNA
Connect the antenna and install it in an upright position with clear line of sight