Collector voltage of TR4 is better about 5V , change the 1M resistance base-collector to 820K or 680K or collector resistance from 4.7K to 5.6K. Emitter voltage of TR5 must be less than 6V. The lrl is very sensitive to the proximity of the human body and the important thing is that there be variations touching the antenna. However, it is crucial the field test. It is also important that the handle is long enough to keep the body away from the LRL, I think that is a fair measure 25cm.
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