ah but thats not how it works. You need an antenna, you can't just bolt it to the frame and hope for the best.
Otherwise cars wouldn't have radio antennas at all, they'd just bolt straight to the chassis/body.
You need an antenna
So stick an antenna somewhere then.
For frames that would attenuate / block the signal to a device inside the frame, have a small PIFA antenna moulded inside the saddle.
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ah but thats not how it works. You need an antenna, you can't just bolt it to the frame and hope for the best.
Otherwise cars wouldn't have radio antennas at all, they'd just bolt straight to the chassis/body.