Talk to me about coax.

[Strawberry]

I'm thinking I'd like to put a discone in the loft as I've just bought an RTL SDR V4, the coax run would need to come back down to the ground floor via a bit of a convoluted run, about 40 meters, maybe a bit more by my guess.

I don't want to use thick RG213 type cable as it's bulky, ugly and it doesn't go round tight corners well,

I've got most of a reel of 75 ohm sat cable, I was thinking about using that but, yeah 75ohm, not ideal.

I'd like advice and ideas on what would be the best 50 ohm option, about 7mm max diameter, fairly flexible and hopefully not too lossy.
Thanks
Neil

[ch25]

Use sat cable.
I use sat cable to all my rx antennas cause it's cheap and 75/50 Ohm doesn't matter in that case.
I also use 75 Ohm coax to my transmit antennas, but antenna must be monoband.
Chris