In Ham Nation episode 266, Bob talks about building a coaxial dipole. He says it is broad-banded and does not need a tuner. The picture shows how it is constructed.
Note the center wire is not cut. The shield is cut and feed with another coax. There is a whole lot more information on building the coax dipole in the 266 episode including the end components, so view the episode before building this dipole.
View Ham Nation episode 266