I need to power everything below the redstone's path, but placing a repeater leads to the block below not being powered. How could I solve that without using a repeater to skip a block?
At the 13th block of redstone, place one redstone piece to the side, place one repeater in front of it, and reconnect it at the 15th block of redstone, like so. (triangle is a repeater)
Unfortunately, this only works if you don't want to be able to turn it off again. If that's required, more resources are needed.
This requires a second line alongside the first one which applies power every 15 blocks (this can be extended to 29 blocks if the redstone power level doesn't matter, as power is applied in both directions).