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PIFA Antenna from AN043 in a narrow long PCB

Hi 

We have to design new device with BLE connectivity and PCB antenna. And we want to use PIFA antenna from AN043. But our PCB is long and narrow. We think to place antenna along the pcb, like this:

But we don't sure that it is a good idea. All dimensions are taken from the AN043, but we are worried that there will bad efficiency.

Help us please, tell will it work good?