Tuned loops are a smaller in size and can be directive, plenty info on You Tube...
Tuned loops aka Resonant Loops (RLs) definitely can be smaller and definitely can be directive with some caveats. I have been a user of small RLs for a number of years and will attest to their performance, and also to their potential for further development.
There is a ton of material posted on the tubes, some of it good, some of it bad, some of it incomplete. To buy a RL, one has to deal with a very limited set of commercial offerings. To build a RL - Roll Your Own in MW parlance - all this information needs to be filtered carefully.
I do have a design for a RL which works very well for me from 90 to 41 meters, and that is pictured here:

I would be more than happy to share that design with others, and I will start to tidy up things (schematics and drawings) so that this can be posted at some point in the future. In the short term, I think I will start a new thread in this Equipment section which will discuss some of the advantages/disadvantages of using a Resonant Loop, and what can realistically be expected.