Build a 2m and 70cm Quadrifilar Helix- they'll give you coverage virtually horizon to horizon. Stick them on the roof by using a number of hose clamps to attach the PVC mast to one of the roof's metal plumbing vent pipes (not a gas exhaust or anything with hot air).
Low profile, completely temporary, and good coverage.
Tim KI6VBY
On Thu, Oct 29, 2009 at 2:57 AM, Tim Goodrich [email protected] wrote:
Build a 2m and 70cm Quadrifilar Helix- they'll give you coverage virtually horizon to horizon. Stick them on the roof by using a number of hose clamps to attach the PVC mast to one of the roof's metal plumbing vent pipes (not a gas exhaust or anything with hot air).
Low profile, completely temporary, and good coverage.
Tim KI6VBY
Tim's idea is a fine one. Alternatively, you could use AA2TX's lindenblad designs. You can even get away with a simple groundplane bolted onto a female bulkhead N-connector.
In all these cases, though, the most important addition to your setup, especially on 70cm, will be a low-noise preamp which is connected to the antenna by a short run of very low-loss coax, such as LMR400.
Finally, as for hand-held use, have you tried operating your ht with hand-held yagi indoors as if you were out-of-doors? Depending on the sort of building you live in, this can work fairly well.
73, Bruce http://ve9qrp.blogspot.com
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Bruce Robertson -
Tim Goodrich