Tape measure yagi

These are directional tuned antennas, perfect for fox hunting.

Note that in both antennas, the measurement between elements is center to center and does not take into account extra length added by the pvc cross piece.

2m yagi

• https://w5nor.org/tape/
• https://www.jpole-antenna.com/2017/02/07/build-it-2-meter-tape-measure-yagi-beam-antenna/
• https://www.instructables.com/The-Tape-Measure-Antenna/

part	dimension
reflector	41 3/8"
r-d pvc	8"
driven element	35 1/2"
d-d pvc	12 1/2"
director	35 1/8"
hairpin	12 gauge / 5"	(with 1/4" tips to solder)

70cm yagi

• https://w5hrc.org/media/2020/11/Tape-Measure-Yagi-440.pdf

Note: the hairpin match is quite short, and can sometimes be just a bit longer than the gap between the elements, despite the picture.

part	dimensions
reflector	13 19/32"
r-d pvc	2"
driven element	5 3/8" (x2)
d-d pvc	3 3/32"
director	11 1/16"

KQ4VQC Yagis

3d printed clamp

clip to hold tape on the clamp

See also

• CAD files, also linked individually below.
• 3D printable element mount replaces PVC cross piece (2 parts, STEP format)

2m Design

• Bandwidth: <2 SWR 138Mhz-150Mhz
• Gain: 9.5 Dbi
• 2M EZnec model

TODO: partslist

Part	Length	Offset From Reflector
Reflector	39.5"	0"
Driven element	17.5" (x2)	12.5"
Director 1	34"	17.5"
Director 2	34"	27"
Director 3	33.5"	41"
Hairpin Match	4"	Director

1.25m Design:

• Bandwidth: <2 SWR 210Mhz-240Mhz
• Gain: 9.38 Dbi
• 1.25M EZnec model

Part	Length	Offset From Reflector
Reflector	24.5"	0"
Driven element	10.75" (x2)	10"
Director 1	20.5"	13.75"
Director 2	20"	23"
Director 3	20"	33.75"
Hairpin Match	3"	Director

70cm Design:

• Bandwidth: <2 SWR 407Mhz-490Mhz
• Gain: 10.74 Dbi
• 70cm EZnec model

Part	Length	Offset From Reflector
Reflector	12"	0"
Driven element	4.75" (x2)	5.25"
Director 1	9.5"	7"
Director 2	9.5"	11.5"
Director 3	9.5"	17.25"
Director 4	9.5"	23.5"
Director 5	9"	30.5"
Hairpin Match	2"	Director