Best roof antenna for vintage tube fm tuner

I've got a really nice Mcintosh MR71 tuner that has been completely restored and updated. In my listening room, I have a jack for a standard coaxial 75 Ohm cable.

My radio station KKXT Dallas is about 30 miles as the rf flies and it's pretty flat around here. I'm just using the 300 Ohm indoor antenna that came with the tuner and I'm only getting 5 (at best) out of 10 for signal strength.

I spoke to a local roof antenna installer who says that the way to go is the current circular antenna's versus a directional one because I'd get better overall performance for all stations. There is one local station in the other direction that I sometimes listen to.

I'm trying to determine how much better it will sounds the closer I get to 10 out of 10 signal strength and how much that will affect quality of sound because right now I'm getting a bit of fuzz. If I go through the forums, there are very different opinions. Some say the best is a vintage directional antenna or the S2 omnidirectional dynalab FM antenna.

The installer will install an antenna on the roof and connect it to existing wires which will get the signal to my cable coaxial jack in the room. And he will install his or mine if I buy one, so I'm asking what would work best.

Also, since the MAC MR71 has both 75 and 300 Ohm's does it make sense to change the standard coaxial and go to the old school 300 set up or stick with the 75?

Thanks!

Pete