Howdy Pablo! This virus should has thrown the world into turmoil... I hope it turns out to be a minor virus, not as bad as the flu.
As far as coax for antenna for an H/T, I would assume around 145 MHz and/or 445 MHz for ham bands?
I use a good quality RG-6 for my scanners. This is of course adding in a 1.5:1 SWR but due to being used receive only, it's of little consequence.
I have 800 MHz trunking systems I monitor as well as low band VHF (45 MHz) and the coax I swept is pretty wide band and low loss. I have multiple scanners so I use a small CATV distribution amplifier. Each port is 7 db gain so it compensates for coax losses. I have under 20 meters going to a discone antenna. The amp does provide a bias-t function so i could use an LNA at the antenna....the one I have is 17 db gain but I don't need it. My scanners all have BNC antenna connectors so I use a BNC-F adapter and then about .7 meter pigtails of RG-6 from the amp to the receivers. It all appears to work well.
Food for thought or maybe excess information....
73 de Tim, K4SHF
Tim K4SHF