HI, i am searching for a solution to my wifi problem. I have a dual band router with a 300mbps internet plan, the thing is that the 5.8 ghz band doesnt reach my pc with great connection, reducing my downloads speeds. My question is will i get those 300mbps connecting my pc through an ethernet port to the powerline adapter? or am i better of getting a wifi range extender that supports 5ghz bands like the RE200. 

ps: on my laptop, next to the router, i get 300+ mbps on the 5.8 ghz band.