A good time-domain reflectometer

Thank you Barry! Would TV/FM transmitter and cell BTS installers
normally have such a device? I don't know any ham who has one but
these days I am talking to professional antenna people. And, by the
way, if one thing I am working on pans out, they'll come to install a
BTS right atop my condo. (The challenge will be to convince them to
let me hang HF wires from the same tower :-)