On the VM118 receiver printboard there is an integrated antenna, as I understand the circuit. Can I replace this on-board antenna with a better external antenna, e.g., a wire? How long should this wire be?
And are you sure its impossible to add an external antenna to the transmitter. I don’t care about warranty-problems.
Not a question of warranty, it is just the nature of the circuit.
Check VM118 board, there is a jumper to select internal or external antenna.
Attach a +/- 30cm wire