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This project is intended to aid in tuning a balanced antenna or feedline that has a high impedance 100-600 ohms

A 5 element wide spaced yagi for the 20m long path to Europe was installed at ZL6QH, the antenna is fed with a 600 ohm open wire feed line.

T2FD is a 600-900 ohms folded dipole, terminated with resistor. Feed impedance is coupled with 50/600 ohms voltage balun. It is a wide band antenna with rather low SWR over the full designed frequency range: antenna tuner is seldom needed.

A transmitting antenna 2x15m, about 100 foot doublet antenna fed by a ladder line of about 600 Ohm. Article in Polish and English,

This page provides a detailed example of the modeling and analysis of an 80m delta dipole antenna with a 600-ohm bifilar feedline. The model is based on antennas used by the RAF from 1940 to 1970. It covers the original model specifications, conductor mass calculations, resonance frequency observation, geometry adjustment steps, and final antenna dimensions. The content includes theoretical formulas, resonance frequency calculations, and practical steps for adjusting the antenna for optimal performance. Overall, it serves as a practical guide for hams looking to understand and optimize the performance of a delta dipole antenna for the 80m band.