It turns out that keeping the garage door remote clipped to the starboard underseat pack on my Tour Easy attenuated its RF enough that even the directed receiver antenna couldn’t grab enough signal until I rolled onto the end of the driveway.
While contemplating what’s involved in making a 3D model of the remote’s curved backside, I realized the bike already had a perfect spot:

A few strips of good outdoor-rated foam tape later:

Believe it or not, the camera is looking through the year-old and unwashed fairing on my bike.
Stipulated: aligning the PCB antenna flat against a small aluminum plate atop a bunch of aluminum bars isn’t perfect. However, enough RF wriggles out to trigger our opener from four houses down the hill, giving it plenty of time to haul the door out of my way.
That was trivial …
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