There are also consequences to your battery for utilizing cellular data instead of/in addition to WiFi. I'm an atypical user in that I don't really care about cellular data costs, but it annoys me when my battery begins dropping at a visible rate and my phone becomes toasty warm.
I considered that, but thought the impact would be inconsequential. If you want to save battery life you'd turn one or both antennas off (or GPS, vibrations, screen brightness, etc.). Maybe running both would be too much for the battery though, I don't know.
My phone lasts nearly 24 hours on a charge, I wouldn't mind it last considerably less (18 hours for example) if I used both antennas though.
I don't know how regular web-browsing / app use from the phone with two antennas would affect it, but I frequently use my phone as a WiFi hotspot for a laptop, and that's rather battery intensive.
