<TABLE> <S> <C>

<PAGE>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS FINANCIAL INFORMATION EXTRACTED FROM THE CONSOLIDATED
FINANCIAL STATEMENTS OF WESTOWER CORPORATION FOR THE THREE AND SIX-MONTH PERIOD
ENDED JUNE 30, 1999 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
DOCUMENTS.
</LEGEND>

<S>                             <C>                     <C>
<PERIOD-TYPE>                   9-MOS                   9-MOS
<FISCAL-YEAR-END>                          SEP-30-1999<F1>         SEP-30-1998<F1>
<PERIOD-START>                             OCT-01-1998             OCT-01-1997
<PERIOD-END>                               JUN-30-1999             JUN-30-1998
<CASH>                                       4,204,000              20,080,000
<SECURITIES>                                         0                       0
<RECEIVABLES>                               20,506,000               9,351,000
<ALLOWANCES>                                         0                       0
<INVENTORY>                                  3,133,000               1,959,000
<CURRENT-ASSETS>                            36,984,000              34,627,000
<PP&E>                                      53,095,000               6,620,000
<DEPRECIATION>                               2,878,000               1,766,000
<TOTAL-ASSETS>                             120,332,000              44,075,000
<CURRENT-LIABILITIES>                       16,512,000               8,687,000
<BONDS>                                     57,059,000              15,168,000
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                        85,000                  67,000
<OTHER-SE>                                  43,699,000<F2>          16,803,000<F3>
<TOTAL-LIABILITY-AND-EQUITY>               120,332,000              44,075,000
<SALES>                                              0                       0
<TOTAL-REVENUES>                            68,455,000              35,995,000
<CGS>                                       48,418,000              26,659,000
<TOTAL-COSTS>                                        0                       0
<OTHER-EXPENSES>                            17,518,000               5,484,000
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                           2,051,000                 103,000
<INCOME-PRETAX>                                840,000               4,093,000
<INCOME-TAX>                                 1,386,000               1,270,000
<INCOME-CONTINUING>                          (546,000)               2,823,000
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                 (546,000)               2,823,000
<EPS-BASIC>                                     (0.07)                    0.46
<EPS-DILUTED>                                   (0.07)                    0.39
<FN>
<F1>The comparative financial information contained in this schedule has been
restated to reflect the October 28, 1997 merger with Western Telecom
Construction Ltd., the May 29, 1998 merger with MJA Communications Corp., and
the August 31, 1998 merger with Standby Services, Inc., all of which were
accounted for as poolings-of-interests.
<F2>Other equity of $43,369,000 at June 30, 1999 is comprised of Additional
paid-in Capital of $39,818,000, Accumulated Other Comprehensive Income of
$(237,000) and Retained Earnings of $4,118,000.
<F3>Other equity of $19,680,000 at June 30, 1998 is comprised of Additional
paid-in Capital of $13,568,000, Accumulated Other Comprehensive Income of
$(176,000) and Retained Earnings of $6,288,000.
</FN>


</TABLE>