I have noticed that many people have a different hammer radius.
A hammer radius can be increased or decreased by doing different things but my question is how can you increase your hammer radius during a game WITHOUT HACKS?
Nobody has a different hammer radius…
Get host. 
when a hammer has more radius it means the person has host
Hammer someone in the head, that way it lands closest to them as possible. Swing too early and you risk missing and only damaging them. Swing at a group of people all standing beside each other and you get your 1-2-3-overkill/extermination. But ya the radius doesn’t vary.
“Wait a second, he is killing everyone because he HAS host”
My response to this host who got 158 kills in one game.
Interesting to look at the combat stats of a grifball game. From that you would assume its kill radius would be nowhere greater than 4.4 metres as that is the biggest kill distance i found looking at the some stats. I would imagine that would of been someone with no shields as the average seems to be about 2.9 metres.
> Nobody has a different hammer radius…
nope it can be increased but minorly as i have been in many games where the avg. radius has been over 5m as opposed to 4.4m.
there are things you can do to change your radius hence my question 
Host advantage. If your host it’s easier to get kills. But the radius of the hammer effect is same for everyone.