Where can I purchase a shark-fin Ariel?

Just purchased a portable TV with built-in free-view. I was advised by the seller to buy the Ariel to boost the signal. Is it necessary and if so where can i purchase? I only wanted to keep my kids quiet in the car no clue.any help would be greatly appreciated!
THANK YOU!

Answers:
They are fitted on most new BMW,s Try ebay or a BMW dealer even salvage yards will stock them by now.
be carefull though there are dummy universal ones doing the rounds, all in the name of style?
Try the Rv supply outlets they have units that work nationwide.
Also you cant try Accele electronics's you can find them on the web.

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