'Wire Slim Jim' for 70cm

This Slim Jim for 70cm was homebrewed using a length of 18mm diameter thin-walled PVC tube, 20 SWG copper wire, a BNC socket and ‘M-Seal’(epoxy sealant in dual component lump form).

The wire ends and the flange-type BNC socket are secured with self-tapping screws.

Sealing against water ingress is done with M-Seal.

70cm Wire Slim Jim Antenna

A low SWR (less than 1.5:1) was obtained with the feed point at 25mm from the lower end.

This antenna weighs only 90 grams.

Related post: Open Stub J-Pole for 70cm
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A ¾ λ Ground Plane for 70cm

This antenna is my mast-mounted version of G2BCX OM F.C.Judd's design of a mobile
¾ λ collinear in his 'Two-metre Antenna Handbook'.

It is similar in construction to my ¼ λ Ground Plane for 70cm.

A ¾ λ Ground Plane for 70cm

A SO-239 connector is used.

The driven element, consisting of the ¼ λ lower portion, the ¼ λ hairpin stub and the ½ λ upper portion, is bent from a single brazing rod.

The blue plastic strut gives rigidity to the driven element.

SWR measured lower than 1.5:1 at 435 MHz.

Related post: Another ¼ λ Ground Plane for 70 cm
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