I know the PAN1720 is not a TI product but does have a CC2540 in it.

I have a customer currently placing the PAN1720 on his PCB.  He's looking to get the best range for his module is there an app note that can talk about placement  - should it be on the corner of the PCB or should it be in the middle of the PCB. Again, I know the module has an internal antenna and it's not a TI product but maybe someone can recommend a good app note or placmenet.