Good afternoon, everyone... I'm just getting back into Ham radio after a long absence. On HF, I'm running 100 watts into an AH4 tuner and long wire. From my rig to the tuner (which is outside) is about 70' of coax. I have no RF issues in the shack and a really, really good ground system, with a very high water table under the house. The Ah4 only handles 100 watts. I'm considering buying an amp (likely the 811h) and thinking about new antennas for the amp. With any kind of dipole the run to the antenna feed point will be about 150'. I really don't want any RF in the shack but am also concerned about feed line loss (even with high quality LMR400 or BuryFlex coax). My question... as i consider antenna options with low loss feedlines, 450 ohm ladder line with an in-shack tuner seems likely. I've never used ladder line before. All things being equal, will the ladder line (with maybe only 5' of ladder line in the shack before it exits the house through an 8' high concrete foundation) be more or less likely to introduce RF in the shack as compared to an all coax option? Thanks to all in advance.... Jim .