At home I'm currently getting around 15Mbps download speed using Telkom's LTE sim on my phone (two bars max). What are the chances of doubling/tripling that speed if I were to get a router with antennas similar to that of Huawei's B315 line up?
15Mbp is pretty low. I damn sure you would double your speed with a router. You would probably have to play around with the placement of the unit though.
Just maker sure the router support 2300Mhz TDD LTE band
If you get a directional antenna (EG: Poynting XPOL-0006), it's worth spending the time on the roof to get the router stats as good as possible and then secure the bolts to keep it that way.. try see where you nearest TM Base Station is- point the antenna in that direction and adjust it till they're good.
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Shout if you need further assistance on this
Directional antennas seem pricey. And I don't think I can afford to go over 2k on hardware right now.
Best way is to borrow a Telkom b315 and test with it. Or if you have R249 pm go for this deal https://secure.telkom.co.za/today/shop/home/plan/smartbroadband-wireless-variation/ and add the 500GB for R50 Night Surfer. For 720p streaming on Youtube I have used my ipad with a Telkom prepaid sim and speed tests I did were about 22Mb/s.