OK to use TV coax for microphone?

I am in the UK and have a 10m length of some cheap TV aerial coax.  It 
came from a discount store as a TV coax extension cable.  I measure the 
cable diameter as 4.8mm.

(1) Is it ok to use this sort of coax for a microphone?  I don't want 
an impaired audio signal.  The length I need to use is 3 to 4 metres.

(2) Is it ok for UHF TV or is it actually quite low grade coax and 
prone to interference or mess up the aerial signal?


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