CARLSON Roof towers LLC – 8 Foot Very Heavy Duty Ham Roof Towert



Specifications IO-815HD Closest Competitor’s Tower Total Height
(feet)
Height above Tower
(feet)
Max. Antenna Area
 at 80 mph

(sq. ft.)
Recommended
Mast
8 0 15 AL 2″OD .15w
Tower Height 8 feet (96 inches) 9 feet (108 inches) 8.5 0.5 15 AL 2″OD .15w
Base Width 32 inches 36 inches 9 1 13.3 AL 2″OD .15w
Tower Weight 70 lb. 54 lb. 9.5 1.5 12.6 AL 2″OD .15w
Max. Antenna Wind Area at tower top 15 sq. ft. at 80 mph, 90% within 1 ft of tower top 23 sq. ft. at 85 mph 10 2 12 AL 2″OD .15w
Max. Antenna + Rotor + Mast Weight 250 lb. 120 lb. 10.5 2.5 11.4 AL 2″OD .15w
Tower Top Width 5 inches 5 inches 11 3 10.9 AL 2″OD .15w
Rotor Plate location from Top 64.5 inches 34.75 inches 11.5 3.5 10.4 GS 2″OD .12w
Rotor Mounting Options Hy-Gain or Yaesu
Hy-Gain and Yaesu 12 4 10 GS 2″OD .12w
Thrust Bearing (recommended, +$70) Yaesu GS-065
recommended 12.5 4.5 9.6 GS 2″OD .12w
Maximum Mast Diameter 2.5 inches 2.375 inches 13 5 9.2 GS 2″OD .12w
Mast (recommended, not included)  2″ or 2.5″ OD x 10 foot galvanized steel
 Texcom Steel masts  or  US Tower M10
9 feet long max. 13.5 5.5 8.9 GS 2″OD .12w
Leg material 6061-T6 aluminum (1/4″ thick x 2″ angle) 6061-T6 aluminum
(1/4″ thick x 2″ angle)
14 6 8.6 GS 2″OD .12w
Shelf Material 6061-T6 aluminum (3/16″ thick x 2″ angle) 6061-T6 aluminum
(1/8″ thick x 1.5″ angle)
14.5 6.5 8.3 High Str.
GS 2″OD .12w
Rotor Shelf Material 6061-T6 aluminum (1/4″ thick x 2″ angle) 6061-T6 aluminum
(1/8″ thick x 1.5″ angle)
15 7 8 High Str.
GS 2″OD .12w
Foot material 6061-T6 aluminum (1/4″ thick x 2″ angle) 6061-T6 aluminum
(1.5″ x 2″ angle)
X-Brace and V-Brace material 6061-T6511 aluminum (3/16″ x 2″ flat) 6061-T6511 aluminum
(1/8″ x 1″ flat)
Assembly Hardware 5/16″-18  18-8 stainless steel 1/4″-20  18-8 stainless steel
Foot to Leg hardware 3/8″-16  18-8 stainless steel 3/8″-16  18-8 stainless steel
Lockwashers/nylon locknuts Yes
nylon locknuts
Holes Deburred Yes ?
Part Edges Deburred Yes ?
Climbable Yes – with tower climbing belt or harness No
Tower fully assembled before shipment Yes No

The IO-815HD is perfect for moderate sized HF beam antennas such as the Mosely PRO-67C, Hy-Gain 203BA, 204BA, Explorer-14, TH7DX, KIO 5-band Hex Beam, … The IO-815HD is also one of the best roof towers to use for stacking a VHF beam along with a small HF beam.