Originally Posted by chue.hsien
Is aluminium foil better or a copper wire? I get about 40% less wifi signal after i cut the batterydoor and used aluminum foil... My foil is about 2cm, which is about the same length as the part that used to be in the battery door..
I have not tested aluminum foil yet. With copper wire I got 70% wifi signal to the original. Using a case would reduce the signal slightly。
About the length:
our hand-made antenna has a lot of difference to the original one. such as shape, material, how you connect it to the phone...
I am not a RF expert so I can't figure out the best length for my copper wire antenna. the only way for me is trying.
In fact my final result is a bit longer than the original one but shorter than 3.125cm(1/4λ).
your aluminum foil antenna is in different material, different thickness, different width. maybe 2cm works well for the HTC battery door but not for yours.
by the way, how you connect aluminum foil to your phone?
I soldered the copper wire to the battery door's remaining gold(maybe copper) connector, and used smooth file to make the solder dot as small as possible.
then removed part of the phone's connector's plastic to let copper wire pass.