I have bought one of these (https://www.ebay.co.uk/itm/Parabolic-Dish-Wildlife-Spy-Microphone/222966090855) parabolic microphones. Pretty cheap compared to the Telinga and Dodotronics ones (it still cost a few £ more than my used Zoom H1 though!) , although a lot less portable. It will be interesting to see how effective it is as it is my first parabolic microphone. I will report back here with recordings - let's hope the local resident Song Thrush doesn't stop singing.