I believe the stock antenna is ample enough. go for a change only if you couldnt get any usable signal and please mind the limitations of hobby grade equipment.
be aware that your tx output power remains the same!
I found the stock antenna really sluggish
I m aware of the limitations of hobby grade equipment...and wont even think about doing any thing stupid as we all are already in a big mess
if the tx output power remains the same...then I wonder what's the difference between 2db antenna and 5 db antenna...
if I decide to use the 5db antenna.? what will be the difference?