fr4 data

hi there,
i need to design a 4 element patch antenna array. i have 6inches (w) by 4inches(h) fr4 board. i need to design the array so that feed network, array and impedeance transformer all fit on the stated board can someone please
1)suggest an appropriate operating frequency for the array
2)tell me the dielectric constant, loss tangent and phase velocity for the suggested frequency for fr4

thanks a ton