We test our LTE / 4G antenna at -40 degrees celcius. The antenna performs well over the band even when frozen - this video shows the antenna being tested by Jones Kalunga.This is the smaller A-XPOL-0001 omni-directional antenna.
Product Website: http://poynting.tech/products/lte-gsm/
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South African online sales: http://www.antennas.co.za/Products/ProductList?search=lte