I have two antennas. One is a Comet GP3 for UHF/VHF and the other is an Alpha Delta DX-CC Fan. Both are about 33 feet high. I had RX 8x coax, (75') as my feedline and maintained an acceptable SWR on both UFH/VHF and HF respectively, (and an antenna tuner for HF.) I have replaced both feedlines. The UFH/VHF now has as a feedline 75' of LMR 400 and the HF has 75' of RG 213. Now, both the UHF/VHF are showing a SWR of 3.2 - 4.5 across the entire band spectrum. The same goes true with the HF as well. The fan antenna has the bands 80 / 40 / 20 / 15 and 10 meters. Each one of these bands have shown a considerable SWR increase since I replaced the coax. I am puzzled as to why the considerable increase in SWR since what I have read, these two coax types are highly recommended for the respected frequency ranges. If anything, I was expecting the SWR to decrease, especially with the 20 meter / 70 cm bands. Any clue(s) as what to look for? I have double checked the coax cables. Both are brand new and have no damage. I hooked a MFJ 269 D Analyzer to them prior to the install and found no problems at all. All I did was swap cables; nothing was done to the antennas themselves.