Magnetic loop is your antenna, if you can DIY go and have a look. will not talk about building one because there are plenty instructions online.
I’ve made one myself and h’ve used on SOTA also. Great performance. Can do all band’s and don’t need that many space.
see this site: http://home.alphalink.com.au/~parkerp/projects/projmag.htm
or this: Ham Radio - Magnetic loop transmitting antenna overview and details. - YouTube
73’s
Mata
CS7AFM