Everything You Need For Antenna Guying

We specialize in products and advice on guying and truss support of antennas and other structures. Our main products are optimized synthetic ropes designed for outdoor use and appropriate accessories. Guying mast clamps and all of the ropes are made in the Czech Republic.

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Our story

The Mastrant brand was created in 2007 with the participation of experts in the development and production of synthetic ropes, and in collaboration with several experienced HAM. We started with two rope product lines and a basic range of accessories. We now have over 300 items in our range and supply solutions worldwide. In addition to ropes, we produce several accessories - such as mast clamps, guy rings and most recently ground pegs. We also provide consultancy services. We support amateur radio expeditions, contests and WRTC (since 2014).

Martin Huml, OL5Y / OK1FUA
Founder and CEO

4 Reasons for Guying with Synthetic Guys

Zero Influence

No RF Interaction

Synthetic guy ropes do not effect whatsoever on your antenna.
Light Weight

Light Weight

Steel guywires are 2 times heavier than Mastrant-P, 3 to 5 times heavier than Mastrant-M, and almost 100 times heavier than D-F3 – comparing the ropes/wires with the same breaking strength.
Easy Handling

Easy Handling

It is quite easy to work with Synthetic guy ropes including bending, cutting, and making knots (depending on the type of rope!).
Cost Effective

Cost Effective

Synthetic guy ropes are 2-3 times cheaper than stainless steel guywires of the same breaking strength.

Worth consideration

Why Mastrant?

  • Designed for guying
  • UV resistance
  • High strength
  • Low elongation – no stretch
  • Weather durability
  • Wide range of accessories and "must haves" for antenna work


  • Choose appropriate guywire
  • Calculate lengths
  • Think about it
  • Do it
  • Regularly check it