What type device are you measuring your speeds with? PC? Mac? Phone? Etc?
Have you tried connecting to your Actiontec router via hardwire rather than wifi to narrow down whether the problem is with wifi or something else?
FWIW, I have an Actiontec Rev I router and if I'm in the same room as the router, and using a MacBook Pro or Win 7 PC I consistently get 75/35+ at www.speedtest.net.
On my iPhone 5s, or iPad 2, speeds top out ~35 mb/s up and down.