Quickboost added the top antenna for the tail of the FW 190A-4 to their line of resin aircraft accessories. This latest addition is molded in a cream colored resin, smooth, seamless and bubble free. One thing of note is that they are easy to remove from the mold block taking only a couple of minutes with a saw blade to remove them.
The package states that it is for the Tamiya kit but should work with any kit that you want to covert past an A-3 model. From what I’ve researched about the Tamiya kit, the 1/48thkit comes with the option to do the A-3 or A-4 but the 1/72 only comes as an A-3. Once again Quickboost comes to the rescue to let the 1/72ndmodeler have the same options. All that is needed is to cut along the seam line of the A-3 antenna and glue the A-4 antenna in place.