As most appreciate, you never get something for nothing.
Very compact antennas tend to be very narrow band and inefficient. Nonetheless there are times such as SOTA these compromises are acceptable.
I remember working a station in Argentina on 10m SSB with just a few watts to a Miracle Whip some years ago from indoors! Compact antennas really do work. There are times when the loss of a few S points really don't matter.
The Gawant antenna is similar to the Miracle Whip. This one is homebrewed and I am not sure if it can be built ready-made.
