Does anybody know if this model really works well?

I bought a 7db antenna on ebay that worked iffy, then I bought an 11db antenna that worked even worse.

If this model is known to work well, please let me know how well and why, and what kind of adapter do I need to connect it to my wireless card? (On the specs info page for this model, it says this model has an N-connector, but I can't tell if its a male or female and does my wireless card have an SMA or RP-SMA? What kind of adapter would I need? My wireless PC adapter card is a Linksys model #WMP54G)