Will a wireless signal booster help in this case?

Question

Do it yourself

If you install the Profline U30 device (or any other wireless signal amplifier) ​​as shown in the image attached to the message, will it be able to amplify the wi-fi signal and make it good on the 2nd floor of the building?
More:
There are 2 buildings in the yard. It is necessary that in the second building (point B) on the 2nd floor the wi-fi signal from the modem in the 1st house (point A) is well caught. Now the signal is caught very weakly and periodically disappears. Here I must say that the smartphone (iphone) catches the signal very badly and almost always loses the signal when I go up there. The laptop picks up the signal better, the speed is almost the same as in the first building. If you install Profline U30 as shown in the image, will it be able to pick up the signal from point A well and amplify it so that the signal is picked up well on the 2nd floor of the 2nd building? (distance from point A to point B is about 15 meters)
PS Link to wireless signal amplifier: www.proflinewifi.by
Any other wireless signal amplifier can be used instead of Profline.
I have attached the diagram to the question.

Answer 1

directional antenna you need