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
https://www.twit.tv/shows/ham-nation/episodes/266?autostart=false