Roof straps problem

Hi all, I've been using some roof straps for a while now, I travel at least 120miles to nearest break. My problem is when it rains I find the water runs down the straps and into the car and drips onto the seats...and occassionally the 'missus' lol!
Is there something reallly obvious to stop this happening, or can you advise on some straps where this doesn't happen?
Cheers!

Is there something reallly obvious to stop this happening, or can you advise on some straps where this doesn't happen?
Cheers!