already pm u, pls check

updates: 14/9/2016:

last 8 antenna

any modem that got external antenna port/connector

brands that usually got: huawei, zte, sierra/netgear, prolink

brands that usually does not: dlink (except gateway), alcatel, tplink (except gateway)

2, it uses 2 antenna system, MIMO. it is using dual internal antenna now, no longer old day single antenna design.

trial and error.

for better trial experience, can use phone app that can show nearby stations physical location distribution (although don know which station is which telco), but can save more time searching for ideal pointing direction.

ok, still got last 8

for WIRELESS matter,

no one able to confirm you about 'how much', 'how changes' at real world BEFORE applying various wireless stuffs AT YOUR SITE, if one do tell u the result before any on site trial most probably juz dealer mouth of word for selling or amateur opinion or really a god can forsee anything.

wireless stuffs must be applied it in real world, at your place, then only u know. theory can be reference, but can not conclusive.

by theory, for sure external antenna ~ yagi type - higher dbi and directional type, perform far better compare to existing stock internal antenna - low dbi and omni type. so as long as for 2600mhz band usage, external yagi directonal antenna @ 18dbi works better in terms of either or combination of,
~ signal improvement
~ speed improvement (data flow increase due to higher signal reception & transmission)
~ stability improve (consistent connection, no drop out, or speed quite consistent)
~ lower latency (but this also affected by cable length of external antenna)

OUT OF STOCK NOW

probably next year january

i'm afraid this time would be much further delayed as told by antenna manufacturer there is no order placed by that network vendor yet for this yagi antenna so there is no production. thus i can't get any stock since last december.

(to initiate a production line need at least thousand unit production, i cannot do that as there is relatively small demand at local market, only take some extra production stock every time the branded vendor place an order with antenna manufacturer.)

fastest to get would be the end of February 2017, after CNY.

mid of march 2017 probably