Best LTE antenna setup for HD2 IP67?


I have Peplink Max HD2 IP67 with two SIM cards and I’m trying to get reliable LTE transmission.
To test possible solutions I use this kind of antenna:
with short RF cable. It is a set of 2 pcs, distance between antennas is 10-15 cm.
I connect antennas to Cellular1

Main and Cellular 1 Diversity (aux) to test first SIM card performance and respectively to Cell 2 Main and Cell 2 Diversity to test second SIM

The first SIM card :
Peplink CLI reports band LTE Band 1 (2100 MHz) and RSSI -74 dBm. Without antenna I have 10 dB less (~85 dBm).

Second SIM card - the difference between both signal strengths is similar, -86 dBm vs -80 dBm with antennas.

The Cellular modems are connected to 1800 MHz and 2100 MHz.

This is very strange for me: when I move the same (first) SIM card into my phone, application reports signal strength from range -55 to -61 dBm, it is a 20 dB better value than Peplink. Do You think that I should worry about signal levels?

Finally I want to use both SIM cards from different service providers with 4 antennas, two omnidirectional and two directional.
I plan to connect SIM1 to Cell1 main (omni) + Cell 1 diversity aux (directional). SIM 2 will be connected the same way - Cell2 and Cell 2 diversity aux.

Do You think it is a good setup?

Best regards,

Piotr M.

  1. have you done “site survey” and found the best mounting location? where cell towers are? etc?
  2. do you have the LTE or LTE-A variant of the HD2?
  3. what band was your phone connected to when you were testing its signal? was it in the same location as the peplink antenna?
  4. why would you mix omni and directional? if you know where the cell tower is and have a decent LoS to it, where you are installing is a building and won’t be moving, and there would be no secondary tower it might connect to, then directional could be the better selection.
  5. have you considered a MIMO antenna that has the correct degrees/polarization/separation? That way you could have one antenna instead of two for each cellular modem. there was a recent thread discussing separation and angling of antennas.

Hi mystery,

  1. no site survey. The deployment will be on vehicle, MAX HD2 IP67 will be on mast with short RF cables.
    That’s why I want to have one omni antenna and second directional. The omni will be static, directional will be installed with “rotor”.

  2. That is a good question, I see on the carton box MAX-HD2-M-LTEA-W-IP67, so perhaps this is LTEA.
    From CLI:
    Router Name : MAX-HD2-2
    Product Model : Pepwave MAX HD2
    Hardware Revision : 3
    Serial Number : […]
    Firmware Version : 8.0.0 build 4203

  3. Yes, location the same, the phone is on my desk near Peplink. I see that this is HSPA+ (perhaps 900 MHz?)

  4. If MIMO antenna could be good solution I can try this setup, but initial requirement was to have option for rotating one of the antennas to find best signal strength. Can I mix antenna with sim card, i.e. connect first MIMO omni antenna to Cell1 and Cell2, second MIMO directional to Cell1 aux and Cell2 aux?

Best regards,

Piotr M.