MacBook Pro incredibly slow wifi

So here is the issue that I am having:

I have Oceanic Time Warner Cable (Maui), with 100mpbs down, 5mpbs up. Here are the speeds I receive via speedtest on the devices I use wirelessly:

iPhone 6+: 109.20/5.54

iMac (24" early 2009): 80.38/5.42

MacBook Pro (13" early 2011): 38.43/5.52

Both Macs are running Yosemite 10.10.3

I mean, HOW RIDICULOUS IS THIS?!?!? All 3 devices were tested in the same room as the router, one after the other. I am on 5ghz @ 40mhz, channel 149, no issues (obviously) with anything other than the MacBook. I have tried everything, and just don't understand how the macbook is performing so incredibly poor compared to my other apple devices.