Kinda, but it would help.

As long as the wire was actually connected to the antenna of the phone, the it is theoretically entering into line of site. Cell sites have patterns to their transmissions.....


Wait a minute, I am about to get way too far into this.

Synopsis: It might help, but good luck getting the long wire connected to the actual antenna.
_________________________
I do the things that I must, and really regret, are unfortunately necessary.

RIP OBG