compact usb wifi

Hi all, I'm looking for a compact USB wifi card for use with a laptop. Unfortunately the internal wifi on my work laptop (13" retina macbook pro) is pretty flaky under fedora. My priorities (in order) are: - reliable under fedora - compact enough I can leave it in at all times, including while transporting the laptop - decent range. My temporary borrowed USB wifi is pretty slow in the corner of the office. Any recommendations? Cheers, Bianca