Signal strength, yes. Speed, no.
If you're having to go through all those contortions to get a signal then it would be a sure bet you're on the fringe of the router or access point's signal foot print. If this is the case then all a signal booster is going to do is not only amplify the data signal but all the 2.4ghz noise with it. You're still have the same problem you started out with.
I would recommend a Windsurfer parabolic dish attachment to make your omni-directional antenna directional. It focuses the RF energy in to a more concentrated beam. It's easy to make. Takes about 10 minutes. Ez-12
Or you could purchase one of these baby's. TL-ANT2414A - Welcome to TP-LINK
The antenna, not the router.
And one more thing. What are you doing when the speed drops off?