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I got tired of replacing the antenna mast of the RX300 so when I bought a new OEM antenna mast, I installed it and disconnected wire that powers the antenna motor.
I searched and looked around the RX300 forums and I haven't gotten a single definite answer of a good hidden antenna, so I'm still uncertain.
Pretty sure the curved part is the ground and the core is the conductor.
I experimented with different antennas, nothing is as good as the original antenna fully extended.