Height for 10 meter rotatable diploe needed

[gdotts]

I have home made "rotatable" 10 meter dipole out of alum tubing and mounted on a metal push up mast located 2 feet off the side of my house having a regular roof slant. I will push it up from there to a given height. How high off the roof do I need to go for optimum RX/TX...or is.... it as high as I can go would be best. Please advise.

Thank you

 

[AESFTW]

I have home made "rotatable" 10 meter dipole out of alum tubing and mounted on a metal push up mast located 2 feet off the side of my house having a regular roof slant. I will push it up from there to a given height. How high off the roof do I need to go for optimum RX/TX...or is.... it as high as I can go would be best. Please advise.

Thank you

I have had luck with a homemade "Hamstick" dipole on both 10m as well as 17/20/40m (different antennas obviously) and they were all up 35ft on the roof. No issues whatsoever. Swr was extremely low (nothing tuner couldn't handle).

 

[prcguy]

You will get the lowest angle of radiation at multiples of a half wavelength above ground. The first half wavelength or about 16ft for 10m will give a lower angle than lower heights but 1 wavelength or 2 wavlengths will give a slightly lower take off angle.
prcguy

 

[gdotts]

I am starting off the side of my roof which is 9 feet off the ground then going up from there...but the slope of the roof should come into play I would think.

 

[gdotts]

10 Meter construction question.
The length says 16 feet -5.8" at 400mhz ....8'-2.9" each side.
Now my question if I have an 2" insulator in between the two 8 feet plus legnths do I also count the insulator in with the total legnth or act like the two sides just metal are togeather alumimum total legnth, discount the 2" insulator??

thanks

 

[KE5MC]

10 Meter construction question.
The length says 16 feet -5.8" at 400mhz ....8'-2.9" each side.
Now my question if I have an 2" insulator in between the two 8 feet plus legnths do I also count the insulator in with the total legnth or act like the two sides just metal are togeather alumimum total legnth, discount the 2" insulator??

thanks

The calculators only give you a starting point and the reality of material and location of physical antenna will determine how far from the calculated starting point you are.

Build long and have a means of determining resonant point & SWR of the actual antenna at the height you will be using it at.

Trim length in small increments to meet objectives.

Yes the insulators have an impact and I would not recommend shorting antenna legs to account for them. Much easier to shorten a long antenna than ...

Good Luck,
Mike