Tape Measure Antenna

There are many times you may want a collapsible, directional antenna:

You live in an apartment building and need extra gain to reach the repeater or another station
You need a directional antenna to track down noise on your radio
You are going on vacation and may need extra gain to reach a faraway repeater
You want to work the satellites or download SSTV pictures from ISS
They’re just plain fun to mess around with, and
You wish to participate in the MRAC fox hunt