External antenna for Night Hawk M2

I have purchased a night hawk M2. I want to get the best reception when travelling in my caravan up to top of Australia. Another company said the best external antenna i should buy is a RFI WIDE-BAND MIMO 3G, 4G & 5G PANEL ANTENNA - 700-3800MHZ XPOL-002 but it is about $300

I do not really want to spend more than $200 on an antenna. Does your company provide a directional antenna that will work with the Night Hawk M2 that will achieve best reception possible? Thank you.