Many years ago I used to use RG-58 coax for my base scanner antennas but found it to have too much loss especially at the higher frequencies. Like you, I now use RG-6 QS with much better results compared to RG-58. At 400 MHz RG-58 loses 11.2 dB per 100 feet vs. 4.3 dB for RG-6. That calculates to 2.6 times greater loss at 400 MHz. At 900 MHz RG-58 is much worse with a loss of 20.1 dB per 100 feet compared to 6.0 dB for RG-6. That calculates to 3.3 times greater loss at 900 MHz. Even with your relatively short runs of 25-30 feet as you posted, you would still be losing quite a bit of signal especially at UHF and higher frequencies.
To get the most out of my RG-6 QS coax I use high-quality F compression connectors like the cable/satellite TV companies use. If you prefer, you can also use an RG-6 QS BNC compression connector on the scanner end of the coax to avoid having to use an F-to-BNC adapter.
