modifier le composant pour changer l'antenne n'est pas trivial, et mettre une plus grosse antenne ne va pas forcément marcher mieux à mon avis car la puissance fournie par le module n'est pas assez importante
vous trouverez des essais sur internet par exemple ici
http://thezhut.com/?page_id=414
dans la vidéo il y a une réponse qui explique ceci
First off, the dbm output of this device is quite low so by adding coax feed line just absorbs all of your rf power. Remember this device tx/rx at 2.4g. Two high to feed out an a transmission line without way too much loss. Second, Antenna design is very complicated and requires formulas. All the tx device wants to see is aprox 50 ohms as a match but getting long range on a very low power device can be done and done quite well if one knows about antenna design. I suggest a 4 or 8 pole coax co-linear design. Hell, I got over 4 miles out of my bluetooth junk in open air. Or build a simple dipole and run the dipoles horizontal. This will give one a -20 db rejection from most virtical wifi antennas. S (A is quarter wave length of element gnd plane) Same with element ( B) 235 devide by 2400.000 = 1.170 inches for each element so the over all antenna will be a half wave dipole to equal a total of 2.340 inches. even this if done right will or should give you a range of aprox 1/4 to a 1/2 mile after all you a. re going from minus dbi 6 to 12 to + 0 dbd unity gain. and this is the reference point to all antenna mesured in Dbi or Dbd Antenna height, Gain and matched is where the range is. A good rule of thumb. One watt out into a dipole at 0dbd at 1000 feet is aprox the same range as 1000 watts out at 0 feet with the same antenna will be equal in range and then there is gain, and loss., Do some homework. ARRL antenna hand book. Have a nice day!