Assuming 75 Ohm antenna design for cable TV coax, that causes a return loss

• you can use semi-rigid coax with same SMA connectors used with proper DIY flange tool to make connector cable assemblies for lowest path loss in a reasonably long distance.

Also, cable TV signal loss gets pretty bad in the 1-5GHz range except satellite dish coax, but again, wrong impedance.

I would choose 50 Ohm semi-rigid coax and choose antenna that give gain in the intended direction. You may review flex coax loss per unit length and connector losses to choose the best.

• I use an application that measures RSSI from your WiFi chip and converts that to dBm and ensure that my signal is above -80dBm for 11Mbps and above -76dBm for 54MBps for marginally acceptable performance. Now that I got a new DLink router with 3 high performance antennae, I never have less than -45dBm in the house and can walk across the street more than 40m from the interior router and still have good Skype video calls where the signal gets close to marginal.
• Line of sight gives the best distance.

When I was in NZ, 10 years ago, small beachside towns, some residents had networked all their routers to give wide area coverage to the beach using RIP protocol (an option in many old routers) with designated router MAC address sharing. They used small Yagi antenna pointed towards the beach area for optimal gain.

Assuming 75 Ohm antenna design for cable TV coax, that causes a return loss

• you can use semi-rigid coax with same SMA connectors used with proper DIY flange tool to make connector cable assemblies for lowest path loss in a reasonably long distance.

Also, cable TV signal loss gets pretty bad in the 1-5GHz range except satellite dish coax, but again, wrong impedance.

I would choose 50 Ohm semi-rigid coax and choose antenna that give gain in the intended direction. You may review flex coax loss per unit length and connector losses, so choose the best.

• I use an application that measures RSSI from your WiFi chip and converts that to dBm and ensure that my signal is above -80dBm for 11Mbps and above -76dBm for 54MBps for marginally acceptable performance. Now that I got a new DLink router with 3 high performance antennae, I never have less than -45dBm in the house and can walk across the street more than 40m from the interior router and still have good Skype video calls where the signal gets close to marginal.
• Line of sight gives the best distance.

When I was in New Zealand, 10 years ago, small beachside towns, some residents had networked all their routers to give wide area coverage to the beach using RIP protocol (an option in many old routers) with a designated router MAC address sharing. They used small Yagi antenna, pointed towards the beach area to ensure optimal gain.

Assuming 75 Ohm antenna design for cable TV coax, that causes a return loss

• you can use semi-rigid coax with same SMA connectors used with proper DIY flange tool to make connector cable assemblies for lowest path loss in a reasonably long distance.

Also, cable TV signal loss gets pretty bad in the 1-5GHz range except Satellite dish coax, but again wrong impedance.

I would choose 50 Ohm semi-rigid coax and choose antenna that give gain in the intended direction. You may review flex coax loss per unit length and connector losses to choose the best.

• I use an application that measures RSSI from your WiFi chip and converts that to dBm and ensure that my signal is above -80dBm for 11Mbps and above -76dBm for 54MBps for marginally acceptable performance. Now that I got a new DLink router with 3 high performance antennae, I never have less than -45dBm in the house and can walk across the street more than 40m from the interior router and still have good Skype video calls where the signal gets close to marginal.
• Line of site gives the best distance.

When I was in NZ 10 years ago, small beachside towns, some residents had networked all their routers to give wide area coverage to the beach using RIP protocol (an option in many old routers) with designated Router MAC address sharing. They used small Yogi antenna pointed towards the beach area for optimal gain.

Assuming 75 Ohm antenna design for cable TV coax, that causes a return loss

• you can use semi-rigid coax with same SMA connectors used with proper DIY flange tool to make connector cable assemblies for lowest path loss in a reasonably long distance.

Also, cable TV signal loss gets pretty bad in the 1-5GHz range except satellite dish coax, but again, wrong impedance.

I would choose 50 Ohm semi-rigid coax and choose antenna that give gain in the intended direction. You may review flex coax loss per unit length and connector losses to choose the best.

• I use an application that measures RSSI from your WiFi chip and converts that to dBm and ensure that my signal is above -80dBm for 11Mbps and above -76dBm for 54MBps for marginally acceptable performance. Now that I got a new DLink router with 3 high performance antennae, I never have less than -45dBm in the house and can walk across the street more than 40m from the interior router and still have good Skype video calls where the signal gets close to marginal.
• Line of sight gives the best distance.

When I was in NZ, 10 years ago, small beachside towns, some residents had networked all their routers to give wide area coverage to the beach using RIP protocol (an option in many old routers) with designated router MAC address sharing. They used small Yagi antenna pointed towards the beach area for optimal gain.