5/8'S WAVE VERTICAL ANTENNA
PROFESSIONAL RANGE
MORE THAN DOUBLE YOUR POWER
• 4.8dBi Gain, 2.8 times effective power increase
• 90 MPH plus, wind handling / survival
• +/- 1.5 MHz bandwidth from centre frequency
• Low VSWR +/- 1.5 MHz < 1.5 and center < 1.1
• 50 ohm unbalanced input
• 600 watts power handling
We designed the 5/8 antenna in 1996 and since then we have sold more than 500 of them worldwide. We can count the number of returns on less fingers than you have on one hand. This really is a high performance antenna in every form. Fantastic RF gain, physical strength and durability, high power handling, operation in any climate, and easy installation. We have customers that are still using this antenna after 10 years of little or no maintenance. It is precisely tuned to the operating frequency of your choice and provides your transmitter with a perfect match and a gain of around 4.8dB, increasing your effective radiated power by about 2.8 times.
We have customers that purchased our 5/8 antenna in the early days, later switched and spent much more money on other antennas hoping to get better performance, but were sadly disappointed by inflated gain figures to the horizon and they returned to our 5/8 antenna to restore their performance. Other customers have had frequent problems with Comet CFM-95SL tuning resulting in poor SWR and poor performance.
With correct mounting the RF field strength directly below this antenna is much lower than a dipole. The truly unbalanced input prevents any RF currents traveling down the outer of the feeder cable. This combined with the low field strength below the antenna and tight bandwidth reduces the chance's of audio, TV and other interference considerably and maximises RF power to the horizon.
Coaxial line losses can be considerable at 88-108MHz. For long runs use a good quality cable such as LMR400 or equivalent for connecting the antenna to the transmitter. Total length 2 metres. The antenna is constructed from aluminum with the exception of a few high dielectric strength insulators.
You can see a real picture of our 5/8 antenna at customer-photos.htm used by Laser FM in Sweden. Below is the radiation pattern for our 5/8 antenna showing a cross section of the signal between the antenna and the horizon at 0 and 180 degrees. Looking down from above at the 0 degree point the radition pattern is perfectly circular.
