Okay, I got impatient waiting for captcha's revised design so I decided to take his initial measurement of 6cm for trace lengths and design from that detail alone.
I shared my design on PCBs.io since they are so impressively cheap and ship free all over the world:
https://PCBs.io/share/zd3YaAnd the edge-mount connector I designed with:
http://www.mouser.com/ds/2/238/consma003.062-273742.pdfThey sell 4 copies making them $1.17/each after your area discount but my last two orders came with 5 PCBs each making these $0.94 each if they keep up that freebie.
I had to get a little sneaky with the SMDs to get a standard RP-SMA connector to mount on the board and still have room to squeeze the dipoles into a 0.25" board width and keep all traces 40 mils away from the board edge. I have a screen grab from Eagle below showing the pins and where they should land.
Going up from 0.25" drives the cost up rapidly so I wanted to avoid that if possible because I really want these to be super dirt cheap. I went ahead and ordered a set of four and I'll be able to tell if my RSSI from nodes goes up using this as opposed to a 1/4 wavelength monopole. I don't have a vector analyzer to be able to optimize the dipole lengths but if anyone in the US does, I can send you a spare copy for testing.
A question for the RF blackbelts: Are there any dire consequences to the choices I made in my design to squeeze this down to 0.25" board width? I'm by no means an RF noob much less guru.