ZTE MF668A - external antenna usage - Advice about this model please

[rolexboy]

After reading comments here on external antenna usage mine field , I thought I would ask about this USB modem Ive just come across --

ZTE MF668A HSPA+ USB Aircard

3G/HSDPA/UMTS 850/900/2100MHz

GSM/GPRS/EDGE 850/900/1800/1900MHz

with an external antenna socket .



any advice / comments about its performance with an external antenna most welcome