ColinTheMathmo, 
Woo Hoo !!!
There were some tricky bits in this one, but again, a little bit of lookahead did the trick.
Happy with this.
#CellTower 737
➡️➡️➡️➡️➡️➡️➡️➡️➡️➡️➡️➡️➡️
https://www.andrewt.net/puzzles/cell-tower/?p=737
Current streak: 83 (Bismuth)
Best streak: 93