| 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) |
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| X-Brace and V-Brace material | 6061-T6511 aluminum (3/16″ x 2″ flat) | 6061-T6511 aluminum (1/8″ x 1″ flat) |
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| 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.
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