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The simplest, easy to setup and use I’m aware of is the ATU made for the Talking House or I AM Radio transmitter.
This antenna is pricey unless you can find one used on Ebay or elsewhere. From the manufacturer, Radio Systems, it’s around $300.
It could not be easier to setup. And, if used with the Talking House or I AM Radio transmitter, is legal to use with coax to allow separating the transmitter and antenna. This allows you to place the transmitter some distance from the antenna like in the house.
Find the ATU REMOTE ANTENNA HERE.