Yes, many Android phones have had this feature but their "solution" is often to use the headphones as the antenna. There are considerable issues with having the antenna in the same device when you also are transmitting on frequencies in the same relative space. It is not something that can be solved due to a little thing called physics and the properties of radio waves. By using the headphones not only are you gaining an antenna, but more importantly you are moving it outside and away from the rest of the phone and it's transmitters. This though is a major problem when you have an all digital connector as then you have to look at things like connecting it on a ground pin, which needs all sort of protection and other circuitry to accomplish (and obviously it wouldn't work at all, in any way with wireless headphones). At this point in time it just can't be done.