I think you are comparing RG-8X (the mini stuff) to RG-213. RG-8U has lower
lose than 213.

According to the webpage that I referenced, the differences are as follows:

RG-8X: 0.5dB at 1mhz
1.0 dB at 10mhz

RG-213: 0.2dB at 1mhz
0.6db at 10mhz

The original poster asked about RG-8. No reference to either X or U.
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