Re: 2011-2013 Antenna Mast Lengths
I think my 2011 has the shorter antenna. Universal stub antenna typically don't have the right size thread adapter for chrysler products, but there are several cheap ones on ebay that do. The one I bought for our Liberty a couple years ago works well. Some here just cut down the OEM antenna without much loss in AM sensitivity... but how any here listen to AM radio anyway except for traffic reports.
Hockey puck and shark fin antennas are much more money to build and still have patent issues I think. AM performance is pretty tough to implement, FM is no issue. You typically need receivers with higher sensitivity (higher cost) for them to work well enough. Thats close to $50 more per car, big bucks for manufactures trying to save 50 cents per car.
2011 WK2 Overland Mineral Gray/Black, Advanced warning, V8; 2009 KK Rocky Mtn V6; 2000 WJ Laredo I6; 1979 CJ7 I6... green... miles of smiles :)