I'm currently building a rc radio system using the 433mhz RFM69W transceiver, so far everything works fine, but i am not sure about the way i laid out my antenna and how the layout cripples the efficiency of it. (The connection is stable up to 400m to 600m with a building in between at ~13dbm output power)
The wires are each around 165 mm long to form a quarter wave monopole, the layout in the re-purposed radio is exactly like in the schematic above.
My main concern is the bend in the antenna and the positioning of the ground wire, would you recommend a different antenna design (helical/pre-made?), keeping in mind that the joysticks eat up most of the room except for a few shafts in the middle/sides of the housing just like here:
And would it make a big difference at all?