Shark Fin Aerials

[ArtfulHussy]

Maybe not the right section but has anyone had any experience of these or similar?
http://www.ebay.co.uk/itm/ACP-Universal-Aero-Amplified-AM-FM-Shark-Fin-Aerial-Antenna-Signal-Booster-Part-/390967649682?pt=UK_CarsParts_Vehicles_CarParts_SM&fits=Car+Make%3AFord%7CModel%3APuma&hash=item5b077ce592#ht_1613wt_1199" onclick="window.open(this.href);return false;

 

[ArtfulHussy]

Or here's a thought - can you get a DAB radio and a DAB aerial? Would that work?

 

[ArtfulHussy]

http://www.ebay.co.uk/itm/SONY-CDX-DAB500U-Car-CD-DAB-Digital-Radio-Player-USB-iPod-iPhone-Aerial-Refurb-/351099647636?pt=UK_In_Car_Technology&hash=item51bf2b7694#ht_1665wt_1203" onclick="window.open(this.href);return false;

Looks okay to me, but I've no idea how these things work.