Had the tek 1.5 and in moderate brush it cut out at 500y. Sportdog replaced a collar then antenna, best I ever got was 700y (my ccons clear this in less than a minute!). Was frustrated but liked the training attached so “upgraded “ to the 2.0. Best I ever got was 300y! Sportdog replaced all the same things plus a new hand held but no improvement. Sent back and bought a garmin plus a tractive! Both my Sportdog issues are on YouTube