coax Diameter recommendations for new Base setup

[Stik]

I have a KG1000P and a Ed Fong GMRS antenna. was told to use Messi & Paoloni Ultra Flex 10 . this cable is about 1/2" in diameter which will not work for my install. is there a smaller diameter cable that will work in 50' length?

[SteveShannon]

18 minutes ago, Stik said:

I have a KG1000P and a Ed Fong GMRS antenna. was told to use Messi & Paoloni Ultra Flex 10 . this cable is about 1/2" in diameter which will not work for my install. is there a smaller diameter cable that will work in 50' length?

The M&P is 10 mm which is 0.400. 
You can certainly find smaller diameters. There are lots out there but what you should be looking at is how much loss you can withstand. Smaller diameter cables have higher losses. 
So, can you shorten the run?  Can you get by with a short piece of M&P 7mm Ultraflex but 10 mm everywhere else? Or can you get by losing half of your signal to losses in the cable?

Unfortunately there are tradeoffs. 
 

[Stik]

Thank you for the info. looks like I will be rethinking the cable run to accommodate the larger cable.  

[SteveShannon]

20 minutes ago, Stik said:

Thank you for the info. looks like I will be rethinking the cable run to accommodate the larger cable.  

Here’s a cable loss attenuation chart.  M&P 10 mm cable is very close in attentuation to LMR400 (which is also 0.400” diameter).

https://www.w4rp.com/ref/coax.html

Here’s another:

https://www.universal-radio.com/catalog/cable/coaxperf.html

I use the M&P 10 mm cable.  It’s pretty good.  But when I need to make a sharp bend, or if I couldn’t physically fit the diameter, I would get a short jumper of the best smaller diameter cable I could find, something from M&P or Times Microwave, not because of the cable, but because adding additional connectors can quickly add to loss.  Better quality cables have better connectors.  Never believe that all connectors are the same. Unfortunately,mprice isn’t the only predictor.  I really like the M&P EVOlution connectors.  I also like the old school silver plated Amphenol connectors.

[WRPL700]

9 hours ago, Stik said:

I have a KG1000P and a Ed Fong GMRS antenna. was told to use Messi & Paoloni Ultra Flex 10 . this cable is about 1/2" in diameter which will not work for my install. is there a smaller diameter cable that will work in 50' length?

I am using 50' Browning BR-400 with good luck:   https://shop.mygmrs.com/collections/antennas/products/browning-br-400-low-loss-rf-coax-cable-assembly