all (HF-UHF/SHF)

Bands

Frequency	50 ohm; usable to ~6 GHz, Loss ~0.7 dB/100 ft @30 MHz, ~1.5 @150 MHz, ~3.9 @900 MHz
Power	Handles roughly a kilowatt-plus at HF (power capacity falls with frequency). Velocity factor ~85%; ~40% lower loss than RG-8/RG-213/9913.
Modes	n/a

Connectors

terminations	N, UHF (PL-259), TNC, SMA etc. (crimp/solder)
power req	None (passive feedline).

Flexible low-loss 50 ohm cable, the ham-shack standard for long runs Loss ~0.7 dB/100 ft at 30 MHz; ~40% less than RG-8/RG-213 Velocity factor ~85%; solid center conductor with foam PE dielectric Bonded-foil + braid shield for excellent shielding Usable to ~6 GHz; UV-resistant jacket Widely available pre-terminated or by the foot

Strengths

Big loss reduction over RG-8/213 for long runs; flexible enough to route; ubiquitous connectors and assemblies.

Weaknesses

Solid center conductor tolerates limited flexing; genuine LMR costs more than clones; needs proper crimp tools.

Verdict

The default low-loss feedline for HF-through-UHF runs - if a cable run is long or the band is high, LMR-400 is the baseline everyone compares to.

Times Microwave LMR-400 is the standard flexible low-loss 50-ohm feedline for amateur runs: about 0.7 dB/100 ft at 30 MHz - roughly 40% less loss than RG-8/RG-213 - with an ~85% velocity factor and a bonded foil-plus-braid shield, usable to about 6 GHz.

For a smaller flexible cable see LMR-240; for a classic RG-8 type compare Belden 9913.

Times Microwave LMR-400 (Low-Loss Coax)