spider87,
I think you may have that just a little bit confused, about 'skip' and a signal repeater. What is called 'skip' is a normal/natural occurrence of a radio signal 'bouncing' off of a layer of the several ionized layers of 'atmosphere' around the planet. More a product of 'Momma Nature' than anything else. Those layers of ionization are affected by several things but primarily by the sun. They vary in height, so the angle that a radio signal hit's them will vary too, which means that when it's reflected back to earth it will cover a wide range of distances. So, 'skip' varies a lot. How much it varies depends on the 'activity' of the sun, the frequency band of use, if it's day light or dark, and of course, 'Momma Nature'.
Don't take any of that as being 'definitive', it certainly isn't! But, it covers just about all of what's going on with 'skip', and 'touches' on it's different aspects (sort of a 'street' version?).
- 'Doc