You can buy a very nice kit from Mini Circuits, in either BNC or SMA form factor, that comes with a selection attenuators that can be put together in different combinations:
This is an example of one of the BNC kits:
However, an even better solution would be a fixed 10dB attenuator combined with a 1 to 10dB rotary step attenuator. They are always lots of relatively inexpensive rotary attenuators on eBay:
That way you can dial in to a dB exactly how much additional external attenuation you want/need.
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