I just added a swivel antenna to the Devo 7e’s stock antenna tube. I cut and tapered the stock tube. Then used a coax to extend the connector, so I can mount at the new location.
The ability to adjust the position of the antenna will optimize the RF radiation pattern. Ensuring you have a good signal to your model.
Here is a good, beginner’s video on the topic of Antenna:
Combine this with the Devo 7e range mod. Or you can buy and install the Walkera Devo S upgrade module to turn the Devo 7e into a full range radio transmitter. This is the same module you would need in case you attempted the range mod and failed.
I used two additional items that is pretty inexpensive and can be purchased from BangGood as well.
A 15cm U.FL/IPX to RP-SMA extension ~$1.50
And the standard 2.4GHz RP-SMA antenna ~$3