SIM800L Advice - EMC failure on Radiated Immunity due to GSM Module dropping communications

Hi,
Can someone please explain if I need the curly antenna which is soldered on themodule if I am using an external antenna which is Tango 27 Quad Band 850, 900, 1800 & 1900MHz GSM. Do you think when incorporated into a an electronic device the curly antenna would cause EMC failure?

You can remove the curly wire when you are using a standard antenna. Curly wire is just for cost cutting.