External antenna for Android possible ?

[mpeg4ever]

Hi all.
I'm just wandering if there is any possibiliy to use a nice external antenna (a regular 7dBi omni or similar) together with Wigle client on an Android device. So...I'm in car...fine, smartphone is quick and nice to use. If I had a laptop and a network card I'd just plug in my pigtail/card and connect the antenna...cool...but if I have an android smartphone how can I interface the phone to another external antenna ?
Is there something I could leave in the car together with the antenna ? maybe a bluetooth-talking neat little thing that has a SMA connector ?

Maybe a RASPBERRY ? Anybody can do it ? Would be soooo cool !

Thanks, ciao
Alex