Huawei 5577c poor LTE coverage and poor WIFI

Hello ..

I have a request, I bought a huawei 5577c in the Orange network, the first problem is the LTE range in the apartment does not catch, and the LTE range is caught on the balcony.
Second WIFI problem on this router is a bit weak.
I have a request to better invest in an LTE antenna or in an LTE router with a sim card?
Added after 44 [minutes]:

And why did you take a mobile Mifi LTE router, i.e. E5577? This is mobile equipment, not dedicated to stationary applications. What is this offer? In Orange, only the LTE Internet offer for the home for PLN 59.90 / month and a router with LTE-A, i.e. MF286, for PLN 0. I propose to give up if you can from this subscription and take the one exchanged with MF286, a router with LTE-A worth PLN 600, your E5577 six times less. And as for the range, if it is weak, an external antenna is necessary anyway. See if the E5577 works with http://www.lte-anbieter.info/ltewatch/count_huawei.php?Datei=ltewatch_h or https://dl.dropboxusercontent.com/u/1978345/E5186/E5186%20Toolbox_latest.rar After logging in in them on Airbox 2 Plus will show LTE signal parameters, BTS data. They allow you to force LTE bands on the router. you will check whether you are connecting to the BTS LTE1800NetWorks, Trzebinia-Górnicza 8 or to the chimney of the power plant.

The offer is with a Laptop and this LTE router for home for 59.9 and I have such. I fell in love with this laptop, the router is not important, no tragedy, but I would like to improve the parameters, buy a new one or install it in the antenna and router with a usb input and connect this 5577c

Added after 19 [minutes]:

It connects alternately with LTE1800NetWorks, Trzebinia-Górnicza 8 and
Trzebinia
ul. Mine 2 - energy mast

As you already have, connect it to the laptop via USB and connect it to the Dual LTE external antenna at 1800MHz. But first the mentioned tests have to be done.