To do the antenna one can very easy as well as the costs are nothing.
You need a box of a sweets- surprise Chupa- Chups, a piece of
an old coax, some wire, epoxies, and a little of job.
So, go to do
glass-reinforced plastic rod 5 and upper part of a sweets- surprise
Chupa- Chups 10.
rod and wire 4 for matching coil into item 10.
a metal tube, cut a ring 7 and insert
into item 10.
a plastic cap 8 from a plastic can, fix a RF- socket 9 on it,
solder the wire of the coil 4 to the socket
, solder by 3-5 wire the ring 7 to the socket.
surprise Chupa- Chups
up item 10, fill up it by epoxies 6, and close it by the cap 8.
the epoxies are hardened, drill holes for counterpoises 11 at
low side of the item 10 and through out item 7.
a thread into item 5 and onto counterpoises 11.
braid 3 from a coaxial cable, put on the braid 3 onto item 5 that
before is covered a glue. The length of the braid 3 is equal to
5/8λ for 144 0r 430 MHz.
the spool 4 (any number of turns) with step between turns of 1-mm,
solder the spool to the braid 3.
6 λ/4 counterpoises.
SWR. Chose a tap from the coil 3 to minimum SWR.
on a can of a pen onto the upper end of the rod 5.
on a shrink plastic tube 1 onto the rod 5
the shrink plastic tube.
Get you own