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You do need a vehicle or home kit to get satellite reception but, you can also listen anywhere there is wifi without those kits (headphones).

What about downloading ondemand content and listening offline? If you don't need live radio when you're in a deer blind or riding on your john deere downloading shows might work well for you.

I...

No word on a new portable as far as I know. With the new mobile apps, I'm not sure they're in a rush to make one.

You might want to consider using your smartphone. I'm not sure exactly where/when...