Several points.
Ap’s are usually low power, runs of coax at 2.4 or 5 GHz frequencies are very lossy
You can’t just add antennas, you need to go through approbate splitting of the antenna system to maintain impedance and reduce further losses.
You can use an amp, they are available, I have several for 2.4 GHz.
You could install a second/third AP in the location you need to increase signal.
You could just use a higher power AP, Ubunqui make various hi power AP. I run a 1 watt BulletM2 on into an external antenna which easily covers my whole block and beyond.
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