I got in off eBay
Links to Antennas:
15dBi - http://www.ebay.com/itm/360591276808
10dBi - http://www.ebay.ca/itm/121069347949
Antennas Operating on only 2.4GHz spectrum wont be efficient.
You need an antenna that operates between the frequencies 2.3-2.7GHz (2300-2700MHz).
Digicel WiMAX service operates within the 2.5GHz - 2.7Ghz bands
Links to Antennas:
15dBi - http://www.ebay.com/itm/360591276808
10dBi - http://www.ebay.ca/itm/121069347949