HD Radio going in and out

It would help if you updated your user info to reflect that.

 

I had an aftermarket HD radio installed in my G2 (with preamp) for a few months and then removed it out of frustration. It's nice when it works, but the constant and distracting fading in and out of digital makes it fairly worthless to me. I'm sure there's nothing wrong with the OP's equipment. It's the technology (or maybe the regulation of that technology) that is fundamentally flawed.

XM was still worse, though. At least with HD you have an analog signal as backup!

 

On the Prius C you can permanently disable the HD radio signal on the Entune Nav system by selecting setup, then audio, then had radio settings and selecting Analog. Maybe this will be close to how to do it on the V.

I also leave on the outskirts and the quality changing constantly got very irritating.

 

As indicated before - a longer antenna helps a lot. It should be made for the Prius as it is a loaded coil design. HD is usually 1% of a stations allowable wattage and is therefore very sensitive to antenna design. The lower frequency response of analog, without user equalization controls, makes the switchover obvious for those of us with good frequency range hearing. Plus some stations do not properly synchronize their HD to their analog. HD takes a noticeably longer processing time, so stations are supposed to compensate by delaying the faster propagating analog. Otherwise the music can be off as it switches between the two. In town, my longer antenna HD does not drop back to analog.