I have Sirius XM running through my garmin GPS on a Harley Ultra Classic.
Reception is spotty - even on a clear cloudless day in wide open spaces here in Virginia.

I travel west quite often and it works best when I am heading west.
When I turn and head east - it is terrible - to the point of being unusable.

The antennae is a fairing mount - standard Harley set up.

Any ideas - is there some kid of signal booster I could add ?