Today I was given an antenna...

[Peter Walker]

The overall length of the Driven Element is 6 1/4".

 

[Captain Kilowatt]

So given all that has been posted, what would the antenna be good for? Sending digital?

Boom length is 28 inches
Driven Element is 6 1/4 inch
Reflector is 7 3/8 inch
Directors are 5 5/8 inch

I wound up contacting the company that took over Celwave (RFS World) and they sent me the data sheet for the antenna. I attached it here for those interested. I'm guessing by the information they sent I could use it for working Satellites on the 400MHz frequency range? I just need to find an N to PL-259 Adapter.

Those dimensions that you gave have 800-900 MHz written all over them. In order for the antenna to be for 400 MHz the elements would have to be about 13-14 inches long. It is not uncommon for commercial antenna manufacturers to use the same model number for a variety of frequency ranges. The antenna is usually ordered by model number and frequency range.This simply means that the antenna is identical in every respect except size of scale which is what determines freq. range. I suspect a misunderstanding of dimensions when you asked for info.

 

[Peter Walker]

I'm hoping in the next month or so to be able to purchase an Antenna Analyzer and that should tell me what frequency at least that it might be resonant on.

 

[Captain Kilowatt]

Not many antenna analyzers will go to 800 MHz. I'm holding my ground on this one given the element lengths you quoted. The most basic of all antenna formulas is 468/F in MHz = length of a halfwave in feet. Therefore 468/860 MHz.= 0.544 feet or 6.5 inches. It's a cellular antenna.

 

[hookedon6]

...468/860 MHz.= 0.544 feet or 6.5 inches. It's a cellular antenna.

Ding, Ding, Ding,....... we have a WINNAH:bdh:

 

[EvilBunny]

Frequency Band 300-699.9 MHz
Horizontal Pattern Directional
Antenna Type Yagi/Corner
Electrical Down Tilt Option Fixed
Gain, dBi (dBd) 12.1 (10)
Frequency Range, MHz 406-420
Connector Type RG8A/U N Male
Connector Location Bottom
Mount Type Fixed
Electrical Downtilt, deg 0
Horizontal Beamwidth, deg 50
Mounting Hardware U Bolts .3125 in. (.008 m)
Rated Wind Speed, km/h (mph) 160 (100)
VSWR < 1.5:1
Vertical Beamwidth, deg 40
Polarization Vertical
Front-To-Back Ratio, dB 15 (min.)
Maximum Power Input, W 250
Lightning Protection Direct Ground
Impedance, Ohms 50
Dimensions - HxWxD, mm (in) 406 x 1397 x 102 (16 x 55 x 4)
Weight, kg (lb) 2 (3.75)
Element Material 0.375 in. (10 mm) 6061 - T6 Aluminum Rod
Max Wind Loading Area, m² (ft²) 0.033 (0.35)
Survival Wind Speed, km/h (mph) 200 (125)
Torsional Moment @ Rated Wind on support pipe, N m (ft lbf) 33 (24.5)
Wind Load - Side @ Rated Wind, N (lbf) 62 (14)
Shipping Weight, kg (lb) 3.6 (8)
Packing Dimensions, HxWxD, mm (in) 1524 x 1448 x 406 (60 x 57 x 16)
Shipping Mode UPS
Notes

 

[RatsoW8]

Frequency Band 300-699.9 MHz
Horizontal Pattern Directional
Antenna Type Yagi/Corner
Electrical Down Tilt Option Fixed
Gain, dBi (dBd) 12.1 (10)
Frequency Range, MHz 406-420
Connector Type RG8A/U N Male
Connector Location Bottom
Mount Type Fixed
Electrical Downtilt, deg 0
Horizontal Beamwidth, deg 50
Mounting Hardware U Bolts .3125 in. (.008 m)
Rated Wind Speed, km/h (mph) 160 (100)
VSWR < 1.5:1
Vertical Beamwidth, deg 40
Polarization Vertical
Front-To-Back Ratio, dB 15 (min.)
Maximum Power Input, W 250
Lightning Protection Direct Ground
Impedance, Ohms 50
Dimensions - HxWxD, mm (in) 406 x 1397 x 102 (16 x 55 x 4)
Weight, kg (lb) 2 (3.75)
Element Material 0.375 in. (10 mm) 6061 - T6 Aluminum Rod
Max Wind Loading Area, m² (ft²) 0.033 (0.35)
Survival Wind Speed, km/h (mph) 200 (125)
Torsional Moment @ Rated Wind on support pipe, N m (ft lbf) 33 (24.5)
Wind Load - Side @ Rated Wind, N (lbf) 62 (14)
Shipping Weight, kg (lb) 3.6 (8)
Packing Dimensions, HxWxD, mm (in) 1524 x 1448 x 406 (60 x 57 x 16)
Shipping Mode UPS
Notes

Alrighty then...