Is there an antenna for the WiMax Freshtel 3.5 MHz router Huawei BM632w?

Question

Antenna

Faced with the congestion of the Wimax network (freshtel.ua) in our sector. I noticed that when the signal is higher, the Internet works fine. I decided to make an antenna, so I found the factory ones . I don’t want to spend money, and it’s interesting to make such a device yourself. I've been looking for something like this for a long time, but I never found it. It just happened to be such a miracle .
Actually, I'm asking for help. Post a link or a drawing. I would be very grateful. The frequency of the base station is 3400 - 3600 MHz.