I want to use an Arduino MKR GSM 1400 in my area wich has a bad connectivity on mobile internet. On my phone it's very weak and if i drive to the next village it works sometimes on the arduino with the given standard antenna but I want it to work in a wider range. Is there any antenna available specifically for mobile connections wich you can put on a arduino? And how do you call them and where can I buy such a thing or even build it myself? Do you have any suggestions for such an antenna? And is there something I can improve with just using software to strengthen the signal?