I also considered making my own repeater to extend the range of my more remote cameras, but I'm too busy to build it. Keep in mind when making antenna mods to
not alter the length of the coaxial feed.......at 2.4 GHz a 1/4 inch difference can throw the VSWR out to the point of negating improvements from antenna gain !
Remember installing or tuning C.B. radios how line lengths were optimum at multiples of three feet ? Well VSWR rules still apply here too .....but at fractions of an inch, not in feet ! You are just lucky if simply snipping the line and attaching another antenna improves your reception. I have been working with 2.4 Ghz equipment for the past nine years....... trust me on this.