Ability now increases attack speed and pops by 100% for all Monkeys for 20 seconds.
Homeland Defense is the final upgrade of Path 2 for the Monkey Village in BTD6. It allows the ability to increase attack speed and pops of ALL towers on screen by +100% for 20 seconds, as opposed to the local +50% attack speed and pierce bonus from the Call To Arms ability. The cooldown stays the same at 45 seconds.
Homeland Defense is quite a formidable support tower due to its solid 100% buff to attack speed and pierce. Its global effect allows it to work well even with multiple towers requiring buffs.
The inconvenience of using Homeland Defense comes from it being a huge part of your budget but not being active 44% of the time. Compared to Permanent Brew, Homeland Defense lacks in uptime and its more damage-oriented buff, but Permanent Brew's benefits outweigh Homeland Defense's benefits for most towers. In addition, Homeland Defense synergizes well with towers dependent on Sub-Towers, whereas Alch buffs have little to no benefit for sub-towers.
Homeland Defense deserves a mention for its attack speed buff, which means that it is an excellent Freeplay tower and one of the few places where it shines.
Homeland Defense is sometimes used in 2MPC to buff the tower without stealing pops.
Homeland Defense has a unique synergy with Sentry Paragon, because it both doubles their spawn rate and attack speed.
This strategy remains largely unexplored due to both towers generally being difficult to use.
Because attack speed and pierce bonuses affect the Spike Storm and Carpet of Spikes abilities, Homeland is highly effective in combination with those two towers.
Placement for Homeland Defense is not too important, but try placing it in range of as many towers as possible. If you have multiple Call To Arms within range of many towers on screen specifically for uptime purposes, however, placing a Homeland Defense in an awkward spot is acceptable.
Crosspathing does not matter very much for Homeland Defense, as its ability is not at all affected by crosspaths, unlike Call To Arms which relies on its base range to provide the rallying buff. But generally speaking, a 2-5-0 Homeland Defense is better than 0-5-2, as adding Jungle Drums can further increase attack speed of nearby towers.
Homeland Defense was buffed in Version 8.0 to become more useful than simply a global range Call To Arms, with a much greater attack speed and pierce bonus and an even greater duration. It also received a cooldown buff inherited from the Call To Arms upgrade in Version 22.0.