XM ANTENNA

[Buglet]

 Were is the best place to mount the antenna, inside the fairing like Harley says or out the fairing. Its on a 2017 FLHX SPECIAL. 

[UltraNutZ]

I've never had any issues mounting them internally.  I didn't use HD's $40 mounting bracket either.   

You can see my garmin antenna mounted there to left as well.

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[TXChop]

Best meaning hidden or visible?

I have found the best reception is mounted right on top of the inner fairing by the vent. opposite the vent button.
mounting inside does slightly reduce reception.

[Pirsch Fire Wagon]

Put mine on top of the radio 10 years ago and still works with absolutely no issue whatsoever.

[kristian]

Put mine on top of the radio 10 years ago and still works with absolutely no issue whatsoever.

did the same, no issues at all.