telnet-1,
NO NO NO NO NO.
Do NOT use LAR-1 for 2.4GHz any more.
The AP-LAR-24 was developed to mitigate increasing problems with out-of-band interference by high-power cellular and other systems. AP-LAR-24 should be considered mandatory on all outdoor networks, especially outside the US. ** Without the AP-LAR-24 can result in complete failure of 2.4GHz operations. **
The customer is actually getting two products for the price of one with the AP-LAR-24. They get a high quality lightning arrestor, as well as a high quality bandpass filter (BPF) for the 2400-2483MHz band.
An insertion loss chart is attached to this posting that shows the BPF performance.
***
On another note, here is an answer to a question you did not ask. Do you need to individually ground each LAR?
The answer is No. So long as the AP chassis is properly earthed.
You will find a ground ring with a crimp-type connector in the box for both the LAR-1 and LAR-24. However, use of this is only necessary if the AP itself is not grounded (which should never ever be the case).
In the event of a discharge event, the impedence of the ground path through the chassis is lower than the impedence through copper grounding wires run directly to the LARs. So even if you properly hook up individual copper cables with 6mm cross sections to each LAR, discharge will flow through the chassis anyways.
Given the cost of copper wire, the cost of labor to connect ground lines, and the poor appearance of having many ground wires running to individual antennas, this is an obvious benefit for all Aruba customers.
LARs should be properly torqued and weatherproofed as documented elsewhere in Arubapedia and our Installation Guides.