I personally use some cheap cables from China

Yes me to but are there some Genuine Seller on Aliexpress who offer a good quality?

I bought RG316 from this seller several times, tested it and its parameters well fits with RG316 datasheet:

https://www.aliexpress.com/item/32850357780.htmlanyhow, looking at the list of 6 to 8 ports splitters from microcircuits, the declared insertion loss seems to range between 0.2 and 1.2 dB, depending from the splitter model, for example

https://www.minicircuits.com/pdfs/AD6PS-1+.pdf

The value "between 0.2 and 1.2 dB" is relative and shows insertion loss above theoretical splitter loss, so you're needs to add 7.8 dB to that value:

7.8 + 1.2 = 9 dB

According to the datasheet this 6-port splitter has insertion loss 8-9 dB, which is well corresponds with theoretical insertion loss for balanced splitter:

Insertion loss = 10*log(N) = 10*log(6) = 7.8 dB

where

N - is the number of output ports

as for the cable willing to minimize losses you may consider some pigtails built using LMR-100

LMR100 is much worse than RG142, for example 100 meters at 145 MHz:

**cable** | insertion loss |

**max voltage** | phase delay |

**average power****RG142** | 16.6 dB |

**1900 V** | 147.2 ns |

**1300 W****RG316** | 34.8 dB |

**1200 V** | 147.2 ns |

**500 W****LMR100A** | 31.7 dB |

**500 Vdc / 2000 Vrms** | 153.9 ns |

**100 W**As you can see, LMR100A is the same as RG316, just a little slower...

By the way, I don't recommend to buy LMR series cable from China. I tried to buy LMR195, but two times I got a bad counterfeit. Tested it and it's impedance was about 63 Ω instead of 50 Ω. I'm not even surprised that both times the cables were visually different and made from different material, and both times it was about 63 Ω, but one of them has significantly worse insertion loss.

For comparison, Chinese RG316 is much better and corresponds with branded RG316.