Well I design and build my own antennas much of the time.. The problem is.. to test it I need to feed it power, and that's not easy to do if you don't have a license (I do not have a receive type antenna analyzer
But most any 2-mtr Ham Radio antenna sold in a store will work on 162.xxx MHZ just fine (That's the weather band) Using my Diamond no-ground-plane 2m/70cm antenna I can get two different weather stations where I am now and in some places 3.. IN other places.. NONE both in the car and the MH
My favorite design is a "J"-pole antenna.. basically it is a length of TV twin lead
To make one you need to know the wave length (300/162 meters) and cut a piece of twin lead 3/4 that length, At the 1/2 wavelength point you cut JUST ONE WIRE. This will give you a "Short End" and a "long End" we are done with the long end.
On the short end short the wires together at the end, Now you tap your coax in (Traditionally the shield is hooked to the short side) a short distance up from the shorted end, about 1.5 inches as I recall without taking measurements.
I would use straight pins and move up/down a bit for best result.
You can getmore precise designs from here Now these are normally cut for the 144-148 MHZ band but Google search page
lists a bunch of 'em
Most of the designs there use copper tubing
Just take any 2-mtr design and shorten by a factor of 146/162 and you got it