LB1120 External Antenna Specifications

[tekuhn]

Hi there. I'd like to experiment with external antennas on my LB1120. The manual provides no technical specifications that I can find. I specifically need to know if this requires 50ohm or 75ohm impedance. I am finding them with both impedances. 50 seems to be more common but performance will suffer if I don't match the equipment properly. Thanks in advance!

[Garyzx]

Did you ever find a antenna for this modem. I'm looking one for LTE any suggestions