The first thing you have to understand is that by increasing the dBi, you're actually changing the way the signal is received and transmitted. Increasing antenna dBi may increase horizontal signals while diminishing vertical signals. Therefore, in a multi-story home, replacing the antennas may not be as beneficial. However, in my case (a single level home) it did increase the signal strength by about 5%. For under $20, you can upgrade your home router with detachable antennas simply by unscrewing the factory 5 dBi antennas and tossing on a pair of these.
The results meant the signal increased to -78 with 19% quality.
Oddly, while the factory antennas preferred a toed-out alignment, the replacement antennas seem to love the straight-up alignment (they're physically about twice the size). It helps to use some sort of signal tool to determine the best placement, but overall, for around $15, I've made a significant improvement in the networks reliability and speed.
What does this mean for you? If you're suffering WiFi issues (like the signal not reaching certain rooms or your yard) then these are a super easy upgrade that anyone can do. All you need to do is make sure is that your router has detachable antennas. If not, pick up a router on Amazon for about $30. I chose the TP-LINK 841ND (There's a D version for detachable, and a non-detachable version, so be careful), and a pair of TP-Link's 8 dBi antennas for about $7.50 a piece.
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