For the best performance, it is always better to replace the entire cable with one single long cord rather than using multiple extenders.

If you are working in a tight space behind a cabinet, the Rocketfish 90-degree Coax Adapter prevents cable damage from sharp bends. How to Extend Your Cable Properly

Look for the Rocketfish Coaxial Cable Couplers (2-pack). These are gold-plated for better corrosion resistance and signal transfer.

Are you extending this for a modem or a TV antenna ?

Every connection adds a small amount of signal loss (roughly 0.1dB for a coupler). If your internet drops or TV signal flickers, you may need a Coaxial Amplifier to boost the strength.