Roof rack clamps

[LBB]

I have a question about the clamps for the roof rack.
As you guys know, the roof rack is kind of aerodynamic, and I didn't find any clamps that could be used with them.
I would like to install some antennas up there, but I don't want to pay the price some something ready made.

I actually will use a window clamp to get the antenna cable out of the car and from there to the antenna.
I would use a magnet base, but this is too easy to steal and I want that people have to spend a little more time there if they want to steal my antenna.

So does anybody knows where I could get two single clamps that would fit?

 

[The_Roadie]

Lots of roof rack places like Surco sell rectangular nut plates that could slide into the track, and then you assemble some bracketry on top. The secret is just finding the right kind of nut plate.