while two WiFi connections can work, if youdo it that way you will need to disconnect from one and reconnect to other everytime you move from one extreme to the other. also you only extend your range by the distance from one to the other.
what you need (for a weak signal) is a repeater. it is a box designed to listen on one WiFi channel and repeat it on another. bin turn it also listens on the repeated channel for communication from your remote device and repeats it onto the original channel so it is as if the new channel is the original channel... place this repeater at half strength distance (power source will be needed but wires to base computer not needed) and you have extended your range by about half the distance...
to go further out just add another repeater (or more)
I googled "WiFi repeater" and was presented with a wide range of options (see photo for partial screenie)... generally the more expensive the further or wider the range... without even looking further i would suspect that the more expensive ones likely could even cover more range than two of that modem you showed combined
a few shown might be the kind with two units that you plug one near base computer and plug other farthest away from base... they not only use house wiring to power the units but also use the electric wire as an antenna for comunicating as if there were an ethernet connection between them.
My
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