I see lot's of posts about 'nails hammered in to make the bat/club a spiked weapon
Nails are awesome at being nails..ie sticking into things when hit with force. Melee weapons are a last resort and your pick need to be able to put down a zed quickly and let you move away quickly. Sure a spiked baseball bat or 2x4 will put a zed down fast but you will be spending the next 30 seconds trying to get the thing out of the zed's skull.
You want to go for light blunt trauma weapons such as wooden pick axe handles; designed to take a lot of damage and not break, very light (carrying and recovering balance) and will crush a skull in a single swing.
i have one of those and frankly its not that hard to pull out of a human skull analog. i've done so trust me.
You pulled a spiked bat out of someone's head! Wow! Now, the only question is did you put it there? LOL!
you missed the word analog as in as good as. as in it was a pig head my dad got from a butcher friend. i should have taken a video of it but we only had it for an hour and i forgot where i left my camera.
Bat weights are great too. weigh it down for power as you see fit
I take old shovel handles, cut them to about three feet, wrap them in compression tape (REAL duct tape works well, too - or Gorilla tape), seal them, add a grip, cut the tip off at about a 35-degree angle, and sometimes I add brad nails to the area below the tip, for about four or five inches.
If you add nails, make sure that you don't use too many, or too large of a type of nail, because it'll really weaken the wood. The nails I add do too, but if you use 1" Brad nails like I do, and sink them about a 1/4" to 1/2" at most into the wood, and between 3/4" and 1 1/2" from each other all the way around the area, you'll have a good amount of laceration, and the nails will be more likely to tear out of the wood in some of the places, than to gouge the wood out and crack it to splinters - although this may still happen with the nails that make direct contact the front of the surface you hit, of course.
If you do add nails, make sure that you add tape the area first - it'll help to keep the wood strong. You can also do this with wooden bats - the Youth Louisville Sluggers are great because you can use them in tighter areas, swing them very effectively with one hand if needed, and they're pretty strong.
If you make a weapon like I've described, the tip will be great for striking a skull, but only add the nails if you're planning to face other humans because the nails won't do much to a zombie, which does not feel pain. THIS WEAPON WILL NOT LAST FOREVER, but it is a way to improve what you can find if you have a little while and a few simple objects. Not to mention, there's a good fear factor on your side since the enemy will recognize that you're serious enough to have a pimped-out weapon, and because no one wants to have their face torn off.
I'm also planning that if I'm ever holed up in a place with a safely-accessible roof, I'll make something like your Polearm and spend day after day on top of the roof, trying to stab as many Zeds through the eye as possible - I figure after a few days of determined stabbing, you're bound to at least make a dent lol.