The mount I created can hold 10 poles. You slip the tip into the smaller hole until there is clearance for the reel side to fit into the larger hole. For really long rods, you can disassemble them in the middle, feed them through the hole, then reconnect them to fit snug in the holder. I spaced my two pieces of wood exactly 5ft apart, seems to be the sweet spot (but may not work if you have very short rods). YMMV. Feel free to get creative and change this around to fit your needs.
You will need:
Piece of Wood (I used a 70 x 3.5 x 3/4 peice of pine from Home Depot, less than $5)
Saw (Hand saw is fine, Home Depot and Walmart sell a nice Stanley setup with mitre box and pegs for $13)
Hole Saws (I used 2in for the larger holes and 1.5 in for the smaller holes) You could use only the 2in if you wish.
6 Screws (I have Kreg pocket hole kit, my favorite tool ever. I highly recommend purchasing one if you don't have it!)
Clamp (not necessary, but will make cutting and drilling the wood much easier)